038AV Super problem.

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Maxparnell

ArboristSite Lurker
Joined
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Hi Guys and Gals,
One of my two 038AV Supers has developed a strange problem.
It only wants to run with the H screw on the carb almost fully closed.
I thought maybe it was a problem with the carb and tried the carb off another working saw and found it still had the same problem; with a bit of fiddling around I worked out that I could make the saw work pretty well using either carb if i almost completely closed the H screw on the carb.
Has anyone come across this before and can tell me what the likely issue is?
Thanks
 
No the air filter is completely clean and as far as I can tell the impulse hose is connected and I don't think that the rubber boot between the carb and the cylinder is holed either..........it also has a new fuel hose and fuel filter on it.
 
Does it make a difference if you turn it on it's side and shake it?
 

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