Discussion for the Kawasaki FA130D-EJ80 4 Stroke Engine
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Our engine is smoking. If the oil refill cap is removed I get blow by out of the vent. There is no blow by out of the oil dipstick. Do we have a stuck valve or a piston with a hole in it?
Chances are your piston rings are worn out. The two indicators are:
1. Blueish smoke from the exhaust (excess engine oil getting inside the combustion chamber and therefore burning)
2. Combustion gas escaping the cylinder by the piston rings and ending up in the crankcase, hence excess fumes/smoke coming out of the oil fill/dip stick hole.
To diagnose and confirm this you would have to do an engine compression test and/or a leak-down test.
Is your engine oil level going down frequently? This would be another sign.
Generally this condition can only be fixed by replacing the piston rings/engine re-build
Good luck and I hope it helps you.