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Mower engine problem
Hi all...
Hoping that someone could point me in the right direction. My parents' Toro gas lawnmower doesn't want to operate.... it will start running but dies within a second. I checked the float in the carb and it works just fine, the needle valve is not stuck and the reservoir has plenty of gas in it. The engine will only start if I prime it about 5 or so times, if I try to start the motor without priming it - it won't budge. I tried different plugs to no avail. However, I noticed that once the motor starts and dies, the plug is wet, which tells me that the mixure is too rich. Couple of questions at this point: - what does the prime button do? Does it only fill up the float chamber with gas? Or does it also pump some gas into the engine for quicker starts? - do lawnmower carbs have an adjustment somewhere where I can reduce the amount of gas sucked into the combustion chamber? Any help would be greatly appreciated. Alex |
Mower engine problem
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Mower engine problem
This will probably cost you a big whooping 50 cents but try it.
Replace the rubber fuel line. It may have a crack in it that opens and draws air after the engine starts. My mower did the same thing and that was the problem. Hope this helps. |
Mower engine problem
On May 14, 11:56 pm, Tony Hwang wrote:
wrote: Hi all... Hoping that someone could point me in the right direction. My parents' Toro gas lawnmower doesn't want to operate.... it will start running but dies within a second. I checked the float in the carb and it works just fine, the needle valve is not stuck and the reservoir has plenty of gas in it. The engine will only start if I prime it about 5 or so times, if I try to start the motor without priming it - it won't budge. I tried different plugs to no avail. However, I noticed that once the motor starts and dies, the plug is wet, which tells me that the mixure is too rich. Couple of questions at this point: - what does the prime button do? Does it only fill up the float chamber with gas? Or does it also pump some gas into the engine for quicker starts? - do lawnmower carbs have an adjustment somewhere where I can reduce the amount of gas sucked into the combustion chamber? Any help would be greatly appreciated. Alex Hi, First thing to check then is air filter. How does the exhaust smoke look? Newer carbs don't have much in adjustment due to emission control standard. Try to run it without air filter for temporary.- Hide quoted text - - Show quoted text - Hi Tony... sorry about that, I should have also mentioned that I did run it without the air filter. I can see the throttle valve so I'm assuming air supply is OK. |
Mower engine problem
On May 15, 7:31 am, wrote:
This will probably cost you a big whooping 50 cents but try it. Replace the rubber fuel line. It may have a crack in it that opens and draws air after the engine starts. My mower did the same thing and that was the problem. Hope this helps. I'll give it a try, thanks. I have a spare fuel line handy. However, the float reservoir is full of gas (gas is fed from the top and drawn into the carb from the bottom). Would a cracked line have any effect on this? Also, I'm kinda baffled as to why the spark is wet after the engine dies. It's as if it was getting too much gas in there. |
Mower engine problem
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Mower engine problem
If your spark plug is wet then fuel starvation is not the problem . Have you
tried a new plug. The old one may be breaking down. In any case it sounds to me like loss of spark for whatever reason. wrote in message ups.com... Hi all... Hoping that someone could point me in the right direction. My parents' Toro gas lawnmower doesn't want to operate.... it will start running but dies within a second. I checked the float in the carb and it works just fine, the needle valve is not stuck and the reservoir has plenty of gas in it. The engine will only start if I prime it about 5 or so times, if I try to start the motor without priming it - it won't budge. I tried different plugs to no avail. However, I noticed that once the motor starts and dies, the plug is wet, which tells me that the mixure is too rich. Couple of questions at this point: - what does the prime button do? Does it only fill up the float chamber with gas? Or does it also pump some gas into the engine for quicker starts? - do lawnmower carbs have an adjustment somewhere where I can reduce the amount of gas sucked into the combustion chamber? Any help would be greatly appreciated. Alex |
Mower engine problem
On May 15, 3:29 pm, "jacko" wrote:
If your spark plug is wet then fuel starvation is not the problem . Have you tried a new plug. The old one may be breaking down. In any case it sounds to me like loss of spark for whatever wrote in message ups.com... Hi all... Hoping that someone could point me in the right direction. My parents' Toro gas lawnmower doesn't want to operate.... it will start running but dies within a second. I checked the float in the carb and it works just fine, the needle valve is not stuck and the reservoir has plenty of gas in it. The engine will only start if I prime it about 5 or so times, if I try to start the motor without priming it - it won't budge. I tried different plugs to no avail. However, I noticed that once the motor starts and dies, the plug is wet, which tells me that the mixure is too rich. Couple of questions at this point: - what does the prime button do? Does it only fill up the float chamber with gas? Or does it also pump some gas into the engine for quicker starts? - do lawnmower carbs have an adjustment somewhere where I can reduce the amount of gas sucked into the combustion chamber? Any help would be greatly appreciated. Alex Hey guys... thanks for the replies. I tried two brand new spark plugs with same effect. Checked for spark - she's there too. I thought about trying to do it without the gas cap but it was too late as I was already on the way home. I can understand the clogged cap but how would that explain the wet plug though? In any case, anything is worth trying and I'll get at it next weekend. I'll even swap out carbs with a spare one I have here to see if that is causing the problem. I should have mentioned that the gas in there is over 6 months old (was not stabilized over the winter), but my parents are telling me that it ran ok two weeks ago on the same gas. |
Mower engine problem
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Mower engine problem
At least try some new gas.
wrote in message ps.com... On May 15, 3:29 pm, "jacko" wrote: If your spark plug is wet then fuel starvation is not the problem . Have you tried a new plug. The old one may be breaking down. In any case it sounds to me like loss of spark for whatever wrote in message ups.com... Hi all... Hoping that someone could point me in the right direction. My parents' Toro gas lawnmower doesn't want to operate.... it will start running but dies within a second. I checked the float in the carb and it works just fine, the needle valve is not stuck and the reservoir has plenty of gas in it. The engine will only start if I prime it about 5 or so times, if I try to start the motor without priming it - it won't budge. I tried different plugs to no avail. However, I noticed that once the motor starts and dies, the plug is wet, which tells me that the mixure is too rich. Couple of questions at this point: - what does the prime button do? Does it only fill up the float chamber with gas? Or does it also pump some gas into the engine for quicker starts? - do lawnmower carbs have an adjustment somewhere where I can reduce the amount of gas sucked into the combustion chamber? Any help would be greatly appreciated. Alex Hey guys... thanks for the replies. I tried two brand new spark plugs with same effect. Checked for spark - she's there too. I thought about trying to do it without the gas cap but it was too late as I was already on the way home. I can understand the clogged cap but how would that explain the wet plug though? In any case, anything is worth trying and I'll get at it next weekend. I'll even swap out carbs with a spare one I have here to see if that is causing the problem. I should have mentioned that the gas in there is over 6 months old (was not stabilized over the winter), but my parents are telling me that it ran ok two weeks ago on the same gas. |
Mower engine problem
On May 15, 6:21 pm, "jacko" wrote:
At least try some new wrote in message ps.com... On May 15, 3:29 pm, "jacko" wrote: If your spark plug is wet then fuel starvation is not the problem . Have you tried a new plug. The old one may be breaking down. In any case it sounds to me like loss of spark for whatever wrote in message roups.com... Hi all... Hoping that someone could point me in the right direction. My parents' Toro gas lawnmower doesn't want to operate.... it will start running but dies within a second. I checked the float in the carb and it works just fine, the needle valve is not stuck and the reservoir has plenty of gas in it. The engine will only start if I prime it about 5 or so times, if I try to start the motor without priming it - it won't budge. I tried different plugs to no avail. However, I noticed that once the motor starts and dies, the plug is wet, which tells me that the mixure is too rich. Couple of questions at this point: - what does the prime button do? Does it only fill up the float chamber with gas? Or does it also pump some gas into the engine for quicker starts? - do lawnmower carbs have an adjustment somewhere where I can reduce the amount of gas sucked into the combustion chamber? Any help would be greatly appreciated. Alex Hey guys... thanks for the replies. I tried two brand new spark plugs with same effect. Checked for spark - she's there too. I thought about trying to do it without the gas cap but it was too late as I was already on the way home. I can understand the clogged cap but how would that explain the wet plug though? In any case, anything is worth trying and I'll get at it next weekend. I'll even swap out carbs with a spare one I have here to see if that is causing the problem. I should have mentioned that the gas in there is over 6 months old (was not stabilized over the winter), but my parents are telling me that it ran ok two weeks ago on the same gas. I did not gap the plugs... probably should have. Also, will try the gas.... Quickie question though: what does the prime bulb do? Does it pump the gas into the carb from the float reservoir for quicker starts? Looks like the gas is gravity fed from the tank so that's the only purpose of the prime bulb that I can see. This may explain why the motor will start after about five presses of the bulb and then dies.... it might have something with gas starvation. Hmmmm.. |
Mower engine problem
I think the mower gap is either 025 or 030. I'd try 025 first.
I've seen mowers wtih water in the gas. They behave just like this. Please try taking off the float bowl from the carb, and see if you've got water. -- Christopher A. Young You can't shout down a troll. You have to starve them. .. wrote in message oups.com... : I did not gap the plugs... probably should have. : Also, will try the gas.... : Quickie question though: what does the prime bulb do? Does it pump the : gas into the carb from the float reservoir for quicker starts? : Looks like the gas is gravity fed from the tank so that's the only : purpose of the prime bulb that I can see. : This may explain why the motor will start after about five presses of : the bulb and then dies.... it might have something with gas : starvation. Hmmmm.. : |
Mower engine problem
Most of these small engines "prime" by spraying gas into the mouth of the
carb. If they start and run for a few seconds you have spark and gas. The "running gas" comes from the bowl. Since you have gas in the bowl, it looks like the tube that lets the flowing air suck the gas out of the bowl is clogged. You have to take the carb apart to the point where you can either blow this tube clear or run a fine wire through it. |
Mower engine problem
On May 16, 5:52 am, "John Gilmer" wrote:
Most of these small engines "prime" by spraying gas into the mouth of the carb. If they start and run for a few seconds you have spark and gas. The "running gas" comes from the bowl. Since you have gas in the bowl, it looks like the tube that lets the flowing air suck the gas out of the bowl is clogged. You have to take the carb apart to the point where you can either blow this tube clear or run a fine wire through it. Thanks John... that's pretty much the conclusion I came to last night, though I wasn't sure what the prime bulb did. I'll have a go at the mower this weekend. Thanks again. Alex |
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