engine flooding with oil

kyle24

New Member
Jan 26, 2011
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hey i just put a new top end on my bike but it floods out with oil from the crank case im thinking my oil level is to high and getting up it to the cylender but havent had a chance to change it yet any ideas
 
When you refilled the transmission, did you put in the recommended 650 ml (2/3 quart) of oil?

If you put more, drain it out and refill with the correct amount.

Once you've done that, build/purchase a leak down tester and leak down test the engine to make sure that the crank seal isn't blown out now.
 
honestly i dont know how much is there ill just have to empty it and put new oil back in whats this tester you are talkin about
 
I think its just under 3/4 of a quart of trans oil it says right in the clutch cover
 
650 mL is the recommended amount of transmission fluid.

1 mL = 0.00105668821 US quarts

So 650 mL is 0.6868473332305001 US quarts. 2/3 = .666666666 ∞
SOOOOO, drain out the transmission and fill it with 2/3 of a quart of fluid (either 10X30 motor oil, ATF, or some sort of gear save gear oil, whatever you choose).

A leak down tester is a device which blocks the exhaust port ensuring an air tight seal, pressurizes the intake boot to a desired amount of pressure, and then has a function to track pressure loss.

Usually an expandable rubber plug for the exhaust port, a PVC adaptor in the intake manifold with a small piece of hose and a low pressure gauge installed with a schrader valve to add air from a bicycle tire pump.
 
there is no way for oil to get into the cylinder except a cracked case or seals...no matter how much u put in
 
kgibson is right.

I probably should have mentioned that the reason to leak test the engine is to find out whether the case or the crank seal is leaking.

I have heard before of people who had blasters which were running good who refilled the transmission fluid to the top and the crank seal let loose under the pressure. I don't know how that works exactly (it seems to me that the only thing filling the transmission up would do is increase the pressure on the outside of the seal by a few inch of water while the pressure inside the crankcase is going from between -30 in mg to 10 PSI) but I've heard of it happening.
 
i am not sure exactly what is goin on when i put the new top end in it started up ran for a few seconds then stalled when i tried to start it agian it wouldnt start so i took the plug out and it was covered in oil
 
you know what when my piston cranked last season i poured oil down where the crank is from the head and i figured it would go into the transmission just trying to clean anything that might have gone down there from the piston and i forgot to change the oil but from what it sounds like that oil actually isnt going into the trans because there is a seal so that would be why my cylinder is flooding with oil
 
you know what when my piston cranked last season i poured oil down where the crank is from the head and i figured it would go into the transmission just trying to clean anything that might have gone down there from the piston and i forgot to change the oil but from what it sounds like that oil actually isnt going into the trans because there is a seal so that would be why my cylinder is flooding with oil

Yes that would be a mistake. you might want to clean that out and put tranny fluid on the right side and oil in your gas for the motor I use a gear or clutch saver for the tranny and some fancy 2 stroke oil for the gas from the yamaha shop no problems