Is there gas in your crank case?

It means your petcock is leaking -- through the fuel line, vacuum line or both -- and that your float needle isn't sealing properly. The gas seeps past the intake valves, into the cylinder, past the rings and into the crankcase.

Do you leave the Raptor petcock on all the time?

verslagen1 wrote on 05/13/11 at 16:29:27:


Still, asking the question.

And is the mixture coming out of the breather hose?
Or is it collecting in the airbox?

ironhead6241 wrote on 05/13/11 at 17:57:01:

Ok, not as bad as you think, more or less normal.
If in great quantity, check your carb for back spitting, take off the rubber ducky between the carb and airbox.  It will run lean so pull the choke.
excessive spitting here could be a tuning issue, improper valve adjustment or your cam is out of time.
you have a raptor petcock and you turn it off when not riding.  good cause the other possibility was the float valve flooding the carb and dripping into the airbox. (always try to park uphill)

"great quantity" may be misleading. There's a drain on the bottom of the airbox. If you drain it once a year you might get a tablespoon full of nasty gunk come out, but if no one has drained it for the past 5, 10, 15 years it basically just sits there with nowhere to go but to get soaked into the airfilter if enough accumulates. Drain the airbox first and ride around a while before you start taking things apart. If it fills up again then you can start dismantling things.

How many miles on the bike?

How high do you fill the oil?

Do you burn a lot of oil?

I noted on my bike that if I overfilled, I get oil in the airbox.
And I filled it to the top line while held vertical.
My bike also has a lot of miles and I just replaced the piston and rings due to excess oil consumption.