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| UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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two stroke chainsaw conked and won;t restart
Fave chainsaw played up t'other day - had been using for an hour or two -
all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K |
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#2
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two stroke chainsaw conked and won;t restart
Jim K wrote:
Fave chainsaw played up t'other day - had been using for an hour or two - all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K sounds like a blocked fuel supply somewhere. Check the clunk is not clogged, and clean the carburettor jets. Not sure how these carbs work, but if that was on a 60's car, I'd diagnose 'blocked idle jet' instantly. |
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#3
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two stroke chainsaw conked and won;t restart
On 16/08/2011 10:29, Jim K wrote:
Fave chainsaw played up t'other day - had been using for an hour or two - all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K Air filter blocked? -- Howard Neil |
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#4
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two stroke chainsaw conked and won;t restart
Howard Neil wrote:
On 16/08/2011 10:29, Jim K wrote: Fave chainsaw played up t'other day - had been using for an hour or two - all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K Air filter blocked? more likley to idle OK and not rev...in that case. |
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#5
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two stroke chainsaw conked and won;t restart
"Howard Neil" wrote in message
o.uk... On 16/08/2011 10:29, Jim K wrote: Fave chainsaw played up t'other day - had been using for an hour or two - all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K Air filter blocked? well it ran at high revs until it failed so assuming air and fuel was/is not an issue... plus the air "filter" is only a fine gauze screen that looked in a reasonable state (has been worse w'out this issue) Cheers Jim K |
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#6
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two stroke chainsaw conked and won;t restart
On 16/08/2011 11:16, The Natural Philosopher wrote:
Howard Neil wrote: Air filter blocked? more likley to idle OK and not rev...in that case. I was thinking air filter until I read your reply. Easy enough to check - ours has a fine mesh screen that washes under a tap, not foam like a lawnmower. This 2 stroke talk reminds me of a little niggle with our Robin HT231 hedge cutter (1993 vintage, but with few hours of use). Fairly easy for me to get going, even on old petrol mix. Cut hedges for a while, then it dies even with throttle wide open to try to keep it from stalling. Opening the fuel cap causes an audible "hiss" of air rushing in, then it restarts OK. How do the fuel tanks on these bits of kit "breathe" as the fuel is used up? (It only has one tank pickup pipe with a strainer on the end). Fuel cap cannot have holes in as the thing spends its time in all angles. Anything I ought to clean? |
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#7
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two stroke chainsaw conked and won;t restart
"Jim K" wrote in message ... "Howard Neil" wrote in message o.uk... On 16/08/2011 10:29, Jim K wrote: Fave chainsaw played up t'other day - had been using for an hour or two - all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K Air filter blocked? well it ran at high revs until it failed so assuming air and fuel was/is not an issue... plus the air "filter" is only a fine gauze screen that looked in a reasonable state (has been worse w'out this issue) Cheers Jim K I have one doing exactly the same. It is one given to me which would not start Cleaned all up stripped carb checked diaphram etc new fuel etc got it to run fine for about 30 seconds then old fuel pipe gave way Replaced fuel pipe with a proper one from garden machinery repair shop (rather a than the piece of aquarium air hose I had in stock) Was still a b****r to start not helped by starting instructions being in swedish when I did get it to run it ran for 30 seconds and whilst on almost full throttle cut out and would not restart both my other 2 stroke tools start fine so it is not that I cannot do 2 stroke If you do solve the problem I would love to know Regards |
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#8
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two stroke chainsaw conked and won;t restart
TMC used his keyboard to write :
"Jim K" wrote in message ... "Howard Neil" wrote in message o.uk... On 16/08/2011 10:29, Jim K wrote: Fave chainsaw played up t'other day - had been using for an hour or two - all as normal - then starting dying when should have been idling - i.e. make a cut release throttle trigger, and revs drop down and .....conk. Would restart -on full throttle - and OK at revs but conked again when returning to idle. Next day the fecka won;t start at all. Had plug out, bit sooty but cleaned up OK, magneto creating a spark - felt through fingers from plug lead, quite hard to see spark on plug tho?? Fuel OK (other backup saw running well on it), after trying to start (again) plug/cylinder is wet so presume fuel getting there..... Has a decompression system to start and is hard to pull without using it so assuming compression OK..... Will get a new plug - anything else? Recently it was stored on it's side overnight due to persistent chain oil leak - could this be related? TIA Jim K Air filter blocked? well it ran at high revs until it failed so assuming air and fuel was/is not an issue... plus the air "filter" is only a fine gauze screen that looked in a reasonable state (has been worse w'out this issue) Cheers Jim K I have one doing exactly the same. It is one given to me which would not start Cleaned all up stripped carb checked diaphram etc new fuel etc got it to run fine for about 30 seconds then old fuel pipe gave way Replaced fuel pipe with a proper one from garden machinery repair shop (rather a than the piece of aquarium air hose I had in stock) Was still a b****r to start not helped by starting instructions being in swedish when I did get it to run it ran for 30 seconds and whilst on almost full throttle cut out and would not restart both my other 2 stroke tools start fine so it is not that I cannot do 2 stroke If you do solve the problem I would love to know Regards 2- strokes quite frequently suffer blocked exhausts too. Look for signs of smoke escaping slowly. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
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#9
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two stroke chainsaw conked and won;t restart
On Tue, 16 Aug 2011 11:05:51 +0100, The Natural Philosopher wrote:
Not sure how these carbs work, but if that was on a 60's car, I'd diagnose 'blocked idle jet' instantly. That is what is going through my mind as well. I'd try very hard not to fiddle with any adjustments but wash the carb out backwards and some compressed air, again backwards. -- Cheers Dave. |
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#10
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two stroke chainsaw conked and won;t restart
On Tue, 16 Aug 2011 14:28:20 +0100, Part Timer wrote:
Fuel cap cannot have holes in as the thing spends its time in all angles. Anything I ought to clean? Not an open hole but it can have a hole with a bit of cork or a simple flap valve arrangement over it on the inside. -- Cheers Dave. |
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#11
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two stroke chainsaw conked and won;t restart
"Dave Liquorice" wrote in message
ll.co.uk... On Tue, 16 Aug 2011 11:05:51 +0100, The Natural Philosopher wrote: Not sure how these carbs work, but if that was on a 60's car, I'd diagnose 'blocked idle jet' instantly. That is what is going through my mind as well. I'd try very hard not to fiddle with any adjustments but wash the carb out backwards and some compressed air, again backwards. mmmm so why won't it start with the usual routine:- choke & full throttle applied, then pull till it "tries", knock the choke in (still full throttle) 2 pulls & away..? Jim K |
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#12
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two stroke chainsaw conked and won;t restart
On Tue, 16 Aug 2011 20:49:46 +0100, Jim K wrote:
Not sure how these carbs work, but if that was on a 60's car, I'd diagnose 'blocked idle jet' instantly. That is what is going through my mind as well. I'd try very hard not to fiddle with any adjustments but wash the carb out backwards and some compressed air, again backwards. mmmm so why won't it start with the usual routine:- choke & full throttle applied, then pull till it "tries", knock the choke in (still full throttle) 2 pulls & away..? 'Cause it's a two stroke? Two strokes are renown for being tempremental, particulalry when cold. Fairly sure that with most two stroke carbs the "idle" jet is there all the time it doesn't get shut off or anything clever under any throttle settings. So, in theory, if it's blocked, there is less fuel avialable for the cold start, in theory... -- Cheers Dave. |
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