CRF250X TRANS and MOTOR OIL MIXING

[mideastrider]

After a 3 hour race I noticed oil dripping from the bottom of the air box onto the swingarm. I thought he just flipped it or something. I didn't check the oil first but after I drained it I thought it was more than normal. I drained the trans oil and only got about 4 oz. Appears the oil is being sucked into the crankcase from the transmission. Is it getting by the crank seal or the balance shaft seal ? Are there other ways for the oil to enter the crankcase?

 

[Rich Rohrich]

There is an oil seal on the right side end of the crank that separates the crankcase and the gearbox. When it fails oil can move from one side to the other.

 

[mideastrider]

So replacing the RH crank seal should solve my problem ?

 

[Rich Rohrich]

It's certainly the place to start. ;-)

 

[mideastrider]

I will put a new crank seal in first thing in the morning. Got a race this weekend we'll see what happens. THANKS!

 

[mideastrider]

Changed out the crank seal ran a 3 hour race with no problems.

 

[_JOE_]

Cool.