Small Engine
Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Answered in 1 hour by:
8/30/2011
Hank F., Technician
Category: Small Engine
Satisfied Customers: 18,141
Experience: Certified on Onan and Generac generators
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These are all signs of too much crankcase pressure.
The causes of this are:
Too much oil in the crankcase.
Plugged/damaged breather valve.
Valves misadjusted.
Bad cylinder (rings, cylinder damage, valve damage).
Another, less likely, possibility is that there is not enough fuel getting to the engine. A bad regulator can cause that.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 18,141
Experience: Certified on Onan and Generac generators
VerifiedHank F. and 87 other Small Engine Specialists are ready to help you
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