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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28058
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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My yamaha golf cart just started blowing blue smoke out the

Customer Question

my yamaha golf cart just started blowing blue smoke out the exhaust.
Submitted: 2 years ago.
Category: Small Engine
Expert:  Curtis B. replied 2 years ago.
two cycle or four cycle. engine?
Customer: replied 2 years ago.
four cycle
Expert:  Curtis B. replied 2 years ago.
Four cycle has oil in the crankcase, could the oil be over full from gas in the oil? Does oil smell of fuel? from a leaking needle valve in carburetor
Customer: replied 2 years ago.
i am ready for a call !
Expert:  Curtis B. replied 2 years ago.
Did you see my initial reply?
Customer: replied 2 years ago.
Yes the oil seams ok the level was low when smoke started.
Customer: replied 2 years ago.
The gas in tank smelled oily is there a way that oil can mix thru fuel pump?
Expert:  Curtis B. replied 2 years ago.
No, oil would have to been added to the gas!
Customer: replied 2 years ago.
i drained tank and replaced with new fuel and as i said before i checked compression it was 170 psi.
Expert:  Curtis B. replied 2 years ago.
And it still smokes?
Customer: replied 2 years ago.
yes
Expert:  Curtis B. replied 2 years ago.
Check the crankcase vent, it goes into the intake, before the carburetor.
Customer: replied 2 years ago.
ok ill get back to you,
Expert:  Curtis B. replied 2 years ago.
If it is plugged or restricted, crankcase pressure will buildup and oil will go into the cylinder. Causing smoking.
Customer: replied 2 years ago.
I don't see anything between carb and head
Expert:  Curtis B. replied 2 years ago.
it would be back toward the air cleaner end!
Expert:  Curtis B. replied 2 years ago.
What kind of fuel pump do you have? Pulse pump can be sucking oil in!
Customer: replied 2 years ago.
Everything seems open and clear , can this be a ring or piston or head block problem and still have good compression?
Customer: replied 2 years ago.
im not sure about pump it is mounted on tank and has line to carb and one line goes to top of engine and also under block some where cant tell .
Expert:  Curtis B. replied 2 years ago.
Did you check the fuel pump pulse line? See if the line is full of oil. If not the fuel pump, worn rings can do it. Just not something that just shows up!
Customer: replied 2 years ago.
No oil in any lines at fuel pump
Expert:  Curtis B. replied 2 years ago.
Not fuel pump, not oil in gas ,that only leaves internal engine problem.
Customer: replied 2 years ago.
Ok thank you , I will have to probably have to find local repair
Expert:  Curtis B. replied 2 years ago.
Ok, thanks!