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Jeff Policky
Jeff Policky, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 2425
Experience:  Yamaha Gold, Suzuki Gold, Honda Bronze, Polaris Bronze, BRP
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I have a Kymco Mongoose 70 that is getting pressure on the

Customer Question

I have a Kymco Mongoose 70 that is getting pressure on the crankcase. It seems to have good cylinder pressure but after running for awhile the engine will bog down at higher rpms. When I shut it down there is pressure on the dipstick and the oil is frothy.
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Wayne S. replied 1 year ago.

Have you checked the breather tube to the air box for obstructions?

Being overfilled with oil can cause frothy oil. Try a lower oil level.

Water in the oil can also cause frothy looking oil. Change the oil.

Bogging at high speed can be caused by an exhaust pipe or muffler restriction. Check the spark plug color for clues on the fuel mixture.

Black or sooty plug is too much fuel possibly from a plugged exhaust

not allowing the air to flow through the engine. Check the pipe etc.

Check the air filter condition.

Some pressure is normal if the dipstick is opened while running.


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