I have a 2007 yamaha yzf 250.

Had to do some some bits to it so stripped off the side casing to get at the clutch.

There was a smallish amount of gunk on the casing. Its wasnt the texture of the mayo type you get with a headgasket. It would nearly remind you of vaseline. The rest of the casing was very clean.

im not loosing any coolant ive noticed from the system. Bike is well mantained never noticed water in the oil.

Was thinkn of doing waterpump n seal to be sure its not water getting in.

any opinions ??