McCulloch engine problem

Old 08-22-10, 03:57 AM
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Cool McCulloch engine problem

Hi. I have a McCulloch BVM 240 leaf blower (2 stroke engine).

Mostly the engine starts OK but only on zero throttle. If I increase the gas slightly the engine seems to be missing a beat slightly.

Now the really weird thing is, it runs slightly better if the air flow to the fan, that is the leaf sucker end, is restricted but even with this if I increase the gas it cuts out.

I've cleaned the air filter, checked all screws/bolts are tight, replaced the fuel (40:1), and incured blisters on my hand.

Any ideas anyone???????????

Old 08-22-10, 06:28 AM
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sounds like it is definitely starving for gas
Old 08-28-10, 01:37 PM
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There is less load on the engine if the leaf sucker is closed off. Once you get it running properly, close off the sucker and you'll notice the engine speed up. It's doing less work because it is not pumping air.

That said, I would check the spark arrestor in the muffler. If it is clogged, the engine will not run properly. Remove it and clean it with a blowtorch by burning off the soot that is clogging it. If exhaust is restricted, so is the fuel intake.

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