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Snowblower engine needs choke to run smoothly
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? |
Snowblower engine needs choke to run smoothly
On Feb 5, 12:20*am, Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. *It has always need a little choke to run smoothly after it warms up. *With no choke it runs, but stumbles slightly. *With one click it is a bit smoother, and with two clicks it runs the smoothest. *More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. *The result is exactly the same.. I have fresh gas, use Sta-Bil, etc. *I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. *I'm also curious what the problem is. *A repairman said that all engines are tuned lean due to EPA rules. *Of course there is no way to adjust the mixture. Any ideas what causes this? *Is the repairman right about the mixture set overly lean on purpose? Ii assume this is one of the new carbs that isn't designed to be easily adjusted? The point about being set to run lean is interesting. I have a Sears two stroke blower and it too usually runs best with the choke set to half on. As soon as you move the choke to off, you can hear it slow down. One way for it to be running lean, even with a new carb, is an air leak, eg between the carb and manifold, leaking head gasket, etc. |
Snowblower engine needs choke to run smoothly
On Feb 5, 12:20*am, Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. *It has always need a little choke to run smoothly after it warms up. *With no choke it runs, but stumbles slightly. *With one click it is a bit smoother, and with two clicks it runs the smoothest. *More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. *The result is exactly the same.. I have fresh gas, use Sta-Bil, etc. *I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. *I'm also curious what the problem is. *A repairman said that all engines are tuned lean due to EPA rules. *Of course there is no way to adjust the mixture. Any ideas what causes this? *Is the repairman right about the mixture set overly lean on purpose? If you feel that the carb is not the problem, the next thing to check (in order) would be manifold gasket, cracked manifold, head gasket, sticky exhuast valve ( carboned or gummed up not allowing it to close completely, or closes sluggishly). Hank |
Snowblower engine needs choke to run smoothly
On Sat, 05 Feb 2011 00:20:58 -0500, Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? I'd check the air filter and be sure it is clean or new. Does it run better with the filter removed, not needing the choke... Also look at the spark plug. Adjust the plug gap a little (open or close it a tad) and see what happens or replace the plug. Make sure you have the correct/recommenced plug. Spark Plug Chart: http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm |
Snowblower engine needs choke to run smoothly
In ,
Oren typed: :: On Sat, 05 Feb 2011 00:20:58 -0500, Taylor :: wrote: :: ::: ::: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt ::: Snow" horizontal engine. It has always need a little ::: choke to run smoothly after it warms up. With no choke ::: it runs, but stumbles slightly. With one click it is a ::: bit smoother, and with two clicks it runs the smoothest. ::: More than that, there is too much choke and the engine ::: will die. Mal-adjusted choke position; no-choke is bringing it backwards, partly closing in the opposite direction. Watch the flapper work with air filter removed. Note: Tuning will be different with air filter removed so don't forget to account for that. ::: ::: Thinking that perhaps something is clogged in the ::: carburetor/jet, I replaced the whole carb with a new one. ::: The result is exactly the same. Did you check for full fuel-flow from the tank to the filter and filter to the carb? Partial plug or kink in the hose can pinch off gas supply partly & make run lean. ::: ::: I have fresh gas, use Sta-Bil, etc. I'm not overly ::: worried about it, I just use two clicks of choke for best ::: power. Empty tank & refill with fresh gas newly purchased. If this is last year's gas it could do that, especially if there is an over abundance of Stabil in the gas. ::: ::: However, I suspect that I'm not getting the full 7.5 hp ::: with the choke restricting air intake. I'm also curious ::: what the problem is. A repairman said that all engines ::: are tuned lean due to EPA rules. Of course there is no ::: way to adjust the mixture. I suggest he's blowing smoke; that's still no reason to have the choke to any position but OFF when the engine has warmed up. If it has a carburator and burns gasoline, there most definitely IS a way to adjust the mixture!! Check the carb documentation or the machine's paperwork. ::: ::: Any ideas what causes this? Is the repairman right about ::: the mixture set overly lean on purpose? I think he just wanted you off the phone. Irrelevant to what you're having to do to keep it running right. ::: ::: ::: :: :: I'd check the air filter and be sure it is clean or new. :: Does it run better with the filter removed, not needing :: the choke... :: :: Also look at the spark plug. Adjust the plug gap a little :: (open or close it a tad) and see what happens or replace :: the plug. Make sure you have the correct/recommenced plug. Better to check/adjust the plug gap to precisely what it is supposed to be. Usually it's 0.030" for that size B&S in my experience. :: :: Spark Plug Chart: :: :: http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm Air filter, fuel filter (if you find water, also the gas tank), choke flapper needs adjust, lo-speed screw, low-oil shutoff, fuel line partly plugged, and so on. Does it start easy and then run rough, or is it also hard to start? Stabil makes them hard to start, especially if excessive amount is collected in the carb. bowl. HTH, Twayne` |
Snowblower engine needs choke to run smoothly
On Sat, 5 Feb 2011 15:30:02 -0500, "Twayne"
wrote: If it has a carburator and burns gasoline, there most definitely IS a way to adjust the mixture!! Check the carb documentation or the machine's paperwork. Agreed! I've _never_ seen a B&S engine that did not allow for air/fuel mixture adjustment (since I was knee-high to a grasshopper). OP: enter essential information here, find the link for the machine/parts/exploded view and post it. http://www.briggsandstratton.com/engines/support.aspx |
Snowblower engine needs choke to run smoothly
?
"Oren" wrote Agreed! I've _never_ seen a B&S engine that did not allow for air/fuel mixture adjustment (since I was knee-high to a grasshopper). Have you seen the newer engines? Many no longer have the two screws that allow you to adjust the carb like days gone by. From the Tecumseh manual, page 13 http://www.cpdonline.com/692509.pdf A main or idle adjustment needle may be replaced by an internally fixed jet on some models. The main nozzle contains a ball check valve. The main purpose of this ball check is to eliminate air being drawn down the main nozzle during idle speeds and leaning the idle mixture. |
Snowblower engine needs choke to run smoothly
?
"Twayne" wrote If it has a carburator and burns gasoline, there most definitely IS a way to adjust the mixture!! Check the carb documentation or the machine's paperwork. http://www.cpdonline.com/692509.pdf See page 13. No adjustment on many new carbs |
Snowblower engine needs choke to run smoothly
On Sat, 5 Feb 2011 17:52:19 -0500, "Ed Pawlowski"
wrote: ? "Oren" wrote Agreed! I've _never_ seen a B&S engine that did not allow for air/fuel mixture adjustment (since I was knee-high to a grasshopper). Have you seen the newer engines? Many no longer have the two screws that allow you to adjust the carb like days gone by. From the Tecumseh manual, page 13 http://www.cpdonline.com/692509.pdf A main or idle adjustment needle may be replaced by an internally fixed jet on some models. The main nozzle contains a ball check valve. The main purpose of this ball check is to eliminate air being drawn down the main nozzle during idle speeds and leaning the idle mixture. No. Never saw that before. Learned something today... Maybe the OP will tell us if he has a Tecumseh carb on his B&S engine. It would be interesting to know exactly what he has. In any account he should not need to run his engine with the choke on. |
Snowblower engine needs choke to run smoothly
?
"Oren" wrote From the Tecumseh manual, page 13 http://www.cpdonline.com/692509.pdf A main or idle adjustment needle may be replaced by an internally fixed jet on some models. No. Never saw that before. Learned something today... Maybe the OP will tell us if he has a Tecumseh carb on his B&S engine. It would be interesting to know exactly what he has. In any account he should not need to run his engine with the choke on. Many engines have that feature today to avoid the environmental police. Yes, he should not have to put the choke on, but it may just be a linkage adjustment to get the choke truly off. Can't tell from here. |
Snowblower engine needs choke to run smoothly
On Sat, 05 Feb 2011 00:20:58 -0500, Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? Combined with ethanol in the gas, which causes a lean condition. Try running premium gas and see if that helps - particulatly shell premium if you happen to be in Canada. With Canadian Shell they put ethanol in the regular at up to 10%, which means up to 5% in mid grade and nothing in premium. Works for me. Otherwise you will need to open up one of the fixed jets in the carb a bit. Not easy, but not impossible. |
Snowblower engine needs choke to run smoothly
On Sat, 05 Feb 2011 10:04:22 -0800, Oren wrote:
On Sat, 05 Feb 2011 00:20:58 -0500, Taylor wrote: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? I'd check the air filter and be sure it is clean or new. Does it run better with the filter removed, not needing the choke... Air filter being plugged would cause the OPPOSITE problem. You can be assured this is NOT the problem. However, many engines are set up thet they NEED an air filter to be properly calibrated, and the vast majority of snow blower engines do NOT have an air filter (because it would very quickly freeze up, and there is very little free dust in the air when it is snowing/snowy Also look at the spark plug. Adjust the plug gap a little (open or close it a tad) and see what happens or replace the plug. Make sure you have the correct/recommenced plug. Spark Plug Chart: http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm Again, very unlikely to be the problem. The plug will likely indicate it is running lean, but with unleaded gas, reading a plug is much less effective. |
Snowblower engine needs choke to run smoothly
On Sat, 5 Feb 2011 15:30:02 -0500, "Twayne"
wrote: In , Oren typed: :: On Sat, 05 Feb 2011 00:20:58 -0500, Taylor :: wrote: :: ::: ::: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt ::: Snow" horizontal engine. It has always need a little ::: choke to run smoothly after it warms up. With no choke ::: it runs, but stumbles slightly. With one click it is a ::: bit smoother, and with two clicks it runs the smoothest. ::: More than that, there is too much choke and the engine ::: will die. Mal-adjusted choke position; no-choke is bringing it backwards, partly closing in the opposite direction. Watch the flapper work with air filter removed. Note: Tuning will be different with air filter removed so don't forget to account for that. ::: ::: Thinking that perhaps something is clogged in the ::: carburetor/jet, I replaced the whole carb with a new one. ::: The result is exactly the same. Did you check for full fuel-flow from the tank to the filter and filter to the carb? Partial plug or kink in the hose can pinch off gas supply partly & make run lean. ::: ::: I have fresh gas, use Sta-Bil, etc. I'm not overly ::: worried about it, I just use two clicks of choke for best ::: power. Empty tank & refill with fresh gas newly purchased. If this is last year's gas it could do that, especially if there is an over abundance of Stabil in the gas. ::: ::: However, I suspect that I'm not getting the full 7.5 hp ::: with the choke restricting air intake. I'm also curious ::: what the problem is. A repairman said that all engines ::: are tuned lean due to EPA rules. Of course there is no ::: way to adjust the mixture. I suggest he's blowing smoke; that's still no reason to have the choke to any position but OFF when the engine has warmed up. If it has a carburator and burns gasoline, there most definitely IS a way to adjust the mixture!! Check the carb documentation or the machine's paperwork. Not neccessarily so. There is NO adjustable jet on that carburetor. It may or may not have a removeable/replaceable jet. The jet CAN be drilled to a larger size, but there will be no documentation in the manual to tell you how. ::: ::: Any ideas what causes this? Is the repairman right about ::: the mixture set overly lean on purpose? I think he just wanted you off the phone. Irrelevant to what you're having to do to keep it running right. I WOULD go with a tank of fresh ethanol free fuel as a first step, if ethanol free fuel is a vailable in your area. If not, you could be stuck living with it or properly drilling out the jet. ::: ::: ::: :: :: I'd check the air filter and be sure it is clean or new. :: Does it run better with the filter removed, not needing :: the choke... :: :: Also look at the spark plug. Adjust the plug gap a little :: (open or close it a tad) and see what happens or replace :: the plug. Make sure you have the correct/recommenced plug. Better to check/adjust the plug gap to precisely what it is supposed to be. Usually it's 0.030" for that size B&S in my experience. :: :: Spark Plug Chart: :: :: http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm Air filter, fuel filter (if you find water, also the gas tank), choke flapper needs adjust, lo-speed screw, low-oil shutoff, fuel line partly plugged, and so on. Does it start easy and then run rough, or is it also hard to start? Stabil makes them hard to start, especially if excessive amount is collected in the carb. bowl. HTH, Twayne` |
Snowblower engine needs choke to run smoothly
On Sat, 05 Feb 2011 13:55:11 -0800, Oren wrote:
On Sat, 5 Feb 2011 15:30:02 -0500, "Twayne" wrote: If it has a carburator and burns gasoline, there most definitely IS a way to adjust the mixture!! Check the carb documentation or the machine's paperwork. Agreed! I've _never_ seen a B&S engine that did not allow for air/fuel mixture adjustment (since I was knee-high to a grasshopper). OP: enter essential information here, find the link for the machine/parts/exploded view and post it. http://www.briggsandstratton.com/engines/support.aspx The last 5 or more years there is no adjustment provided. It is an EPA thing. Might be able to put on an earlier carb or modify the current one with old parts. |
Snowblower engine needs choke to run smoothly
Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? Thayne's suggestions about lack of fuel seem the most likely. Does it have a fuel filter? On-off for the fuel? Have you tried running it with the gas tank cap loose or off? Any chance of anything plugging the fuel outlet of the fuel tank? |
Snowblower engine needs choke to run smoothly
On 2/5/2011 10:43 PM, Dean Hoffman wrote:
Taylor wrote: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? Thayne's suggestions about lack of fuel seem the most likely. Does it have a fuel filter? On-off for the fuel? Have you tried running it with the gas tank cap loose or off? Any chance of anything plugging the fuel outlet of the fuel tank? Because it is a snow blower, there is no air filter. The carburetor is inside a "snow hood" which is designed to help it stay warm and prevent icing. There is nothing that I can tell is plugging the fuel outlet, and there is no shut off. I'll try running it with the gas cap off. There are no adjustments on the carb either. Thanks everyone! |
Snowblower engine needs choke to run smoothly
What's likely the problem, is a bad gasket between the carb
and the engine. If there is a gasket, put on some Permatex #IIa, non hardening gasket sealer. Might be sucking air from the gasket, which is after the carb. This is a common problem, and the symptom is usually "won't start unless I pour some gas in the air intake". -- Christopher A. Young Learn more about Jesus www.lds.org .. "Taylor" wrote in message ... My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? |
Snowblower engine needs choke to run smoothly
Dirty air filter does much the same as closing the choke a
bit. You've got it backwards. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Oren" wrote in message ... I'd check the air filter and be sure it is clean or new. Does it run better with the filter removed, not needing the choke... |
Snowblower engine needs choke to run smoothly
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Snowblower engine needs choke to run smoothly
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Snowblower engine needs choke to run smoothly
On Feb 4, 11:20*pm, Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. *It has always need a little choke to run smoothly after it warms up. *With no choke it runs, but stumbles slightly. *With one click it is a bit smoother, and with two clicks it runs the smoothest. *More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. *The result is exactly the same.. I have fresh gas, use Sta-Bil, etc. *I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. *I'm also curious what the problem is. *A repairman said that all engines are tuned lean due to EPA rules. *Of course there is no way to adjust the mixture. Any ideas what causes this? *Is the repairman right about the mixture set overly lean on purpose? Ive never seen a snow blower with an air filter as others state they have, it would get wet and restrict air thats why they dont have them, an air filter will make it run richer needing less choke, not more. How do you know the carb isnt just a poor rebuild, ive seen 6 bad starters in a row. It isnt getting enough fuel or it has an air leak at the manifold or maybe somethings cracked or loose letting in air. I would check the seal if the gasket and check everything. You could take it apart and run wire through the jets to see if they are actualy clean and blow it out with compressed air or put in in carb boil, or enlarge the main jet a bit, but be carefull. Ususaly needing a choke means you need a carb cleaning from old gas varnishing the jets, Ive a a bit of dirt logged in a passage do that and compressed air fixed it. |
Snowblower engine needs choke to run smoothly
What's likely the problem, is a bad gasket between the carb
and the engine. If there is a gasket, put on some Permatex #IIa, non hardening gasket sealer. Might be sucking air from the gasket, which is after the carb. This is a common problem, and the symptom is usually "won't start unless I pour some gas in the air intake". -- Christopher A. Young Learn more about Jesus www.lds.org .. "notbob" wrote in message ... On 2011-02-06, wrote: Air filter being plugged would cause the OPPOSITE problem. You can be assured this is NOT the problem. Bingo! More likely, look for an air leak in the intake tract. |
Snowblower engine needs choke to run smoothly
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Snowblower engine needs choke to run smoothly
The earth is coated with snow, so the air is relatively
clean. Opposed to lawn mowers, when the purpose of the machine is to whomp on the earth, castign up clouds of dust. Hint: Don't run the lawn mower and the AC at the same time. -- Christopher A. Young Learn more about Jesus www.lds.org .. "Oren" wrote in message ... On Sat, 05 Feb 2011 22:22:54 -0500, wrote: the vast majority of snow blower engines do NOT have an air filter (because it would very quickly freeze up, I've read that here before and can't figure why I keep banging my head on the wall ;-) Thanks |
Snowblower engine needs choke to run smoothly
On Sun, 06 Feb 2011 08:51:39 -0500, Stormin Mormon wrote:
What's likely the problem, is a bad gasket between the carb and the engine. For the slightly-larger B+S engines, checking the torque on the head bolts is part of the routine maintenance; they do sometimes loosen up. They're really heavy-duty gaskets and, as far as I can tell, designed to be re-usable - you can take the head off to inspect everything, clean up, and put the same gasket back on again. Unless, perhaps, someone's gooped it up with sealer ;-) cheers Jules |
Snowblower engine needs choke to run smoothly
Last I checked, BS used gaskets that are pretty guaranteed
to be single use. But, who can tell. Maybe the quality has improved? -- Christopher A. Young Learn more about Jesus www.lds.org .. "Jules Richardson" wrote in message ... On Sun, 06 Feb 2011 08:51:39 -0500, Stormin Mormon wrote: What's likely the problem, is a bad gasket between the carb and the engine. For the slightly-larger B+S engines, checking the torque on the head bolts is part of the routine maintenance; they do sometimes loosen up. They're really heavy-duty gaskets and, as far as I can tell, designed to be re-usable - you can take the head off to inspect everything, clean up, and put the same gasket back on again. Unless, perhaps, someone's gooped it up with sealer ;-) cheers Jules |
Snowblower engine needs choke to run smoothly
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Snowblower engine needs choke to run smoothly
In ,
ransley typed: : On Feb 4, 11:20 pm, Taylor wrote: :: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt :: Snow" horizontal engine. It has always need a little :: choke to run smoothly after it warms up. With no choke it :: runs, but stumbles slightly. With one click it is a bit :: smoother, and with two clicks it runs the smoothest. More :: than that, there is too much choke and the engine will die. No, mine have filters. It's part of the can that covers the carb air intake and has the choke handle sticking out of it. They have never been plugged by anything. You must have heatless engines. :: :: Thinking that perhaps something is clogged in the :: carburetor/jet, I replaced the whole carb with a new one. :: The result is exactly the same. :: :: I have fresh gas, use Sta-Bil, etc. I'm not overly :: worried about it, I just use two clicks of choke for best :: power. :: :: However, I suspect that I'm not getting the full 7.5 hp :: with the choke restricting air intake. I'm also curious :: what the problem is. A repairman said that all engines :: are tuned lean due to EPA rules. Of course there is no :: way to adjust the mixture. :: :: Any ideas what causes this? Is the repairman right about :: the mixture set overly lean on purpose? : : Ive never seen a snow blower with an air filter as others : state they have, it would get wet and restrict air thats : why they dont have them, an air filter will make it run : richer needing less choke, not more. : : How do you know the carb isnt just a poor rebuild, ive : seen 6 bad starters in a row. It isnt getting enough fuel : or it has an air leak at the manifold or maybe somethings : cracked or loose letting in air. I would check the seal if : the gasket and check everything. You could take it apart : and run wire through the jets to see if they are actualy : clean and blow it out with compressed air or put in in carb : boil, or enlarge the main jet a bit, but be carefull. : Ususaly needing a choke means you need a carb cleaning from : old gas varnishing the jets, Ive a a bit of dirt logged in : a passage do that and compressed air fixed it. It's interesting how some of the basics get ignored like the gas tank outlet covered with dirt or water, hoses plugged or kinked & not getting fuel TO the bowl in sufficient quantity, or even the float stuck (or sinking?) and so on. No one has even yet mentioned checking the bowl to see if it's filling or rate of output, all that easy kind of stuff. |
Snowblower engine needs choke to run smoothly
On Mon, 07 Feb 2011 11:39:46 -0500, Stormin Mormon wrote:
Last I checked, BS used gaskets that are pretty guaranteed to be single use. But, who can tell. Maybe the quality has improved? No, seen it on old ones - very heavy-duty silver gaskets that don't seem to have compressed at all when removed. Taking the head off was also a routine maintenance thing, which makes me think they're supposed to be good for at least a few cycles. All of the other gaskets on their engines are pretty thin in my experience and aren't intended to survive removal, but the head one's a real monster given the size of the engine. cheers Jules |
Snowblower engine needs choke to run smoothly
On Mon, 7 Feb 2011 14:29:12 -0500, "Twayne"
wrote: In , ransley typed: : On Feb 4, 11:20 pm, Taylor wrote: :: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt :: Snow" horizontal engine. It has always need a little :: choke to run smoothly after it warms up. With no choke it :: runs, but stumbles slightly. With one click it is a bit :: smoother, and with two clicks it runs the smoothest. More :: than that, there is too much choke and the engine will die. No, mine have filters. It's part of the can that covers the carb air intake and has the choke handle sticking out of it. They have never been plugged by anything. You must have heatless engines. :: Funny, none of mine have EVER had filters and I've owned snowblowers for over 30 years, and worked on them for 10 years before that. ALL have had "heated air intake" shrouds. Are your filters paper or foam elements? Got any part numbers? Possibly engines have been replaced with non-snow-blower engines(like tiller, edger, lawnmower, etc) :: Thinking that perhaps something is clogged in the :: carburetor/jet, I replaced the whole carb with a new one. :: The result is exactly the same. :: :: I have fresh gas, use Sta-Bil, etc. I'm not overly :: worried about it, I just use two clicks of choke for best :: power. :: :: However, I suspect that I'm not getting the full 7.5 hp :: with the choke restricting air intake. I'm also curious :: what the problem is. A repairman said that all engines :: are tuned lean due to EPA rules. Of course there is no :: way to adjust the mixture. :: :: Any ideas what causes this? Is the repairman right about :: the mixture set overly lean on purpose? : : Ive never seen a snow blower with an air filter as others : state they have, it would get wet and restrict air thats : why they dont have them, an air filter will make it run : richer needing less choke, not more. : : How do you know the carb isnt just a poor rebuild, ive : seen 6 bad starters in a row. It isnt getting enough fuel : or it has an air leak at the manifold or maybe somethings : cracked or loose letting in air. I would check the seal if : the gasket and check everything. You could take it apart : and run wire through the jets to see if they are actualy : clean and blow it out with compressed air or put in in carb : boil, or enlarge the main jet a bit, but be carefull. : Ususaly needing a choke means you need a carb cleaning from : old gas varnishing the jets, Ive a a bit of dirt logged in : a passage do that and compressed air fixed it. It's interesting how some of the basics get ignored like the gas tank outlet covered with dirt or water, hoses plugged or kinked & not getting fuel TO the bowl in sufficient quantity, or even the float stuck (or sinking?) and so on. No one has even yet mentioned checking the bowl to see if it's filling or rate of output, all that easy kind of stuff. Most, except for the flow from the tank, would be addressed by replacing the carb - which the OP did. NOW - if he put a NON SNO BLOWER CARB on, it WILL run lean without an air filter. And a SINKING cab float will NOT cause the engine to run lean and require choking to run when warm. Just stop and think about it for a second, or even a half second. A sunk float RAISES the fuel level in the bowl, causing flooding, rich running, dripping from the carb, etc................ |
Snowblower engine needs choke to run smoothly
On Mon, 07 Feb 2011 16:25:04 -0500, wrote:
And a SINKING cab float will NOT cause the engine to run lean and require choking to run when warm. Just stop and think about it for a second, or even a half second. A sunk float RAISES the fuel level in the bowl, causing flooding, rich running, dripping from the carb, etc................ ....and a wet spark plug |
Snowblower engine needs choke to run smoothly
Taylor wrote:
My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? Find the fuel adjustment screw. Open it just a touch. |
Snowblower engine needs choke to run smoothly
On Mon, 07 Feb 2011 15:16:46 -0800, Oren wrote:
On Mon, 07 Feb 2011 16:25:04 -0500, wrote: And a SINKING cab float will NOT cause the engine to run lean and require choking to run when warm. Just stop and think about it for a second, or even a half second. A sunk float RAISES the fuel level in the bowl, causing flooding, rich running, dripping from the carb, etc................ ...and a wet spark plug - which is part of the etc............ but usually the carb is low enough that the raw gas runs out, rather than into the carb, so it only gets wet if you try too hard to start it. |
Snowblower engine needs choke to run smoothly
On Mon, 07 Feb 2011 19:59:43 -0500, LSMFT wrote:
Taylor wrote: My snow blower has a Briggs & Stratton 7.5 hp "Powerbuilt Snow" horizontal engine. It has always need a little choke to run smoothly after it warms up. With no choke it runs, but stumbles slightly. With one click it is a bit smoother, and with two clicks it runs the smoothest. More than that, there is too much choke and the engine will die. Thinking that perhaps something is clogged in the carburetor/jet, I replaced the whole carb with a new one. The result is exactly the same. I have fresh gas, use Sta-Bil, etc. I'm not overly worried about it, I just use two clicks of choke for best power. However, I suspect that I'm not getting the full 7.5 hp with the choke restricting air intake. I'm also curious what the problem is. A repairman said that all engines are tuned lean due to EPA rules. Of course there is no way to adjust the mixture. Any ideas what causes this? Is the repairman right about the mixture set overly lean on purpose? Find the fuel adjustment screw. Open it just a touch. Real good idea, except that particular carb/engine doesn't have one. |
Snowblower engine needs choke to run smoothly
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Snowblower engine needs choke to run smoothly
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"LSMFT" wrote Find the fuel adjustment screw. Open it just a touch. Real good idea, except that particular carb/engine doesn't have one. Same on a motorcycle. You have to drill out some metal to get at the adjustment screw. The Tecumseh service book points out they now use a different jet instead of adjusting screw. Nothing to drill. I suspect Briggs and others use the same system. |
Snowblower engine needs choke to run smoothly
Ed Pawlowski wrote:
? "LSMFT" wrote Find the fuel adjustment screw. Open it just a touch. Real good idea, except that particular carb/engine doesn't have one. Same on a motorcycle. You have to drill out some metal to get at the adjustment screw. The Tecumseh service book points out they now use a different jet instead of adjusting screw. Nothing to drill. I suspect Briggs and others use the same system. Thank the EPA for taking away our adjusting screws. Everything is built for morons these days. |
Snowblower engine needs choke to run smoothly
On 2011-02-08, LSMFT wrote:
Thank the EPA for taking away our adjusting screws. Everything is built for morons these days. It's the larger market share. Worse than "morons" are the "I'm right" morons, those morons who are positive they have the problem figured and nothing will dissuade them. When I was a motorcycle mechanic, use to get those types coming in all the time. "It's the carburetor!" "Well, in the case of a 2-stroke...." "It's the carburetor!" "It's been my experience it could also be...." "It's the carburetor!" .....etc ;) nb |
Snowblower engine needs choke to run smoothly
Next, will be non polluting electric snow blowers.
-- Christopher A. Young Learn more about Jesus www.lds.org .. "LSMFT" wrote in message ... The Tecumseh service book points out they now use a different jet instead of adjusting screw. Nothing to drill. I suspect Briggs and others use the same system. Thank the EPA for taking away our adjusting screws. Everything is built for morons these days. |
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