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Hedge trimmer,cuts out
My hedge trimmer( McCulloch 2 stroke) cuts out on idle but runs fine on full
throttle but if I cut a section then go back to idle cuts out and difficult to start unless I leave til cold again. Plug has been changed. I noticed there are 3 adjusment screws. 1 I no for to speed the engine up the other 2 are marked "hi" and "lo". Anyone got ideas I think just a tweak to get it right (I hope) thanks |
#2
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Hedge trimmer,cuts out
"Juco" wrote in message ... My hedge trimmer( McCulloch 2 stroke) cuts out on idle but runs fine on full throttle but if I cut a section then go back to idle cuts out and difficult to start unless I leave til cold again. Plug has been changed. I noticed there are 3 adjusment screws. 1 I no for to speed the engine up the other 2 are marked "hi" and "lo". Anyone got ideas I think just a tweak to get it right (I hope) thanks This can be caused by incorrect fuel/oil mix but assuming it has developed in use then: Try a small adjustment to the lo screw, probably a quarterturn out (anti clockwise), if this makes it worse then turn it back to where it was, then a quarter turn in (clockwise) I neither way improves things then: There is a possibility that the idle jet is blocked in which case it will need a professional look at, mrcheerful |
#3
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Hedge trimmer,cuts out
On Sat, 10 Apr 2004 16:39:41 +0100, "Juco"
wrote: My hedge trimmer( McCulloch 2 stroke) cuts out on idle but runs fine on full throttle but if I cut a section then go back to idle cuts out and difficult to start unless I leave til cold again. Plug has been changed. I noticed there are 3 adjusment screws. 1 I no for to speed the engine up the other 2 are marked "hi" and "lo". Anyone got ideas I think just a tweak to get it right (I hope) thanks This is the usual generic setup for chainsaws etc. They should be set with the engine warm. The one on its own is 'idle speed' - set so it idles without stopping and blades are stationary. Lo is mixture for slow running - set so it idles sweetly (you might now need to reset slow running speed) Hi is correct mixture for full speed/power - set this with throttle full open, tweak 'til revs peak, then back off slightly 'til the revs drop a little and engine sounds more comfortable and giving off very little smoke (professionally this is done with a tachometer to set maker's recommended correct revs - if it's set for absolute peak revs you're thrashing it and the mixture is too lean, runs hot and lubrication breaks down - bang! oops! That's why you back off from peak revs.) You might have to go through this a few times to get it just right. *Before you do anything* Check your starting settings ie atm it will start at least, so you need to be able to get back to that condition if you mess things up. For each jet in turn notice the position of the screw slot then turn it clockwise 'til it stops - note the turns you made, ie half, threequarters, one and a quarter - whatever, and note it down then put the screw back exactly where it was. Now start it, check it's behaving as it was before - now you know you can get back there and can start messing about without fear of ending up with a machine you can't start. Rod Weed my email address to reply http://website.lineone.net/~rodcraddock/index.html |
#4
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Hedge trimmer,cuts out
Thanks for your help guys will give it a go.
"Rod" wrote in message ... On Sat, 10 Apr 2004 16:39:41 +0100, "Juco" wrote: My hedge trimmer( McCulloch 2 stroke) cuts out on idle but runs fine on full throttle but if I cut a section then go back to idle cuts out and difficult to start unless I leave til cold again. Plug has been changed. I noticed there are 3 adjusment screws. 1 I no for to speed the engine up the other 2 are marked "hi" and "lo". Anyone got ideas I think just a tweak to get it right (I hope) thanks This is the usual generic setup for chainsaws etc. They should be set with the engine warm. The one on its own is 'idle speed' - set so it idles without stopping and blades are stationary. Lo is mixture for slow running - set so it idles sweetly (you might now need to reset slow running speed) Hi is correct mixture for full speed/power - set this with throttle full open, tweak 'til revs peak, then back off slightly 'til the revs drop a little and engine sounds more comfortable and giving off very little smoke (professionally this is done with a tachometer to set maker's recommended correct revs - if it's set for absolute peak revs you're thrashing it and the mixture is too lean, runs hot and lubrication breaks down - bang! oops! That's why you back off from peak revs.) You might have to go through this a few times to get it just right. *Before you do anything* Check your starting settings ie atm it will start at least, so you need to be able to get back to that condition if you mess things up. For each jet in turn notice the position of the screw slot then turn it clockwise 'til it stops - note the turns you made, ie half, threequarters, one and a quarter - whatever, and note it down then put the screw back exactly where it was. Now start it, check it's behaving as it was before - now you know you can get back there and can start messing about without fear of ending up with a machine you can't start. Rod Weed my email address to reply http://website.lineone.net/~rodcraddock/index.html |
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