Some small engines, the insullation for the ignition coil breaks down. And
won't run till the unit cools for a while. Briggs and Stratton had this
problem on some lawn mowers.
Could also be that the fuel line goes too close to the engine, and you're
getting vapor lock. Or, over heating. I'd start by cleaning the dust and
crud from the engine, and the cooling fins. Water, simple green cleaner, and
Christopher A. Young
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My 18 year old leaf blower, an ancient Sears model, ran great until
recently. It starts fine, it runs at full power just great, but when I turn
down the throttle, it stalls. It then is almost impossible to start again
unless I wait ten minutes and try again. It runs great at full throttle but
every time I reduce the throttle, it stops and will not restart. Previously,
when I throttled it back, it would just slow down and idle. I always add
stabilizer when I buy a one-gallon refill of gas.
I checked the spark plug, looks fine. I replaced the fuel with new gasoline
plus new oil, no luck. The manual says the carburetor cannot be adjusted.
Any idea what I should be looking for? Would like to keep the blower for
another twenty years. :-)
Thanks for any help