Crank Seals???

[KDXSean]

Got a little puddle of black oil in the bottom of the left hand side cover. Pretty sure I know what this means........


Someone tell me I don't have to split the cases.....

[r1inoz]

you dont have to split em,just pack up the engine and send it to me

but seriously u might have a little work ahead of ya.

[IdahoCharley]

If it were my bike and there was no indication of a lean condition i.e. no high idle, or lean surge and the bike still started like it always has. I would spray down the stator, backing plate and seal area with WD-40 and blow it off with compressed air. (I would also attempt to move the crankend up-down and in-out to see if there was any decernable play. Assuming there was none ...)

I would go on a ride for an hour or two and then recheck the area. Leaks on the left seal would not normally leak outward into the stator area. You would have to have the seal pretty well totally shot to have fuel residue in the stator case. However, condensation, creek crossings, and pressure washing and enough time between pulling the cover can have a little crud appearing in this area.

Don't run it until it blows but at the same time don't pull down the engine for a seal replacement if your not certain it is a seal that needs replacing.

just my .02

[Julien D]

If the seal is bad, you will have to split the cases. There is no way to replace the KDX crank seals from the outside.