crank seals??

[Gonzo355]

my kr is chucking a lot of oily shite out of the right hand exhaust. It has been started fairly often over winter but not riden/properly thrashed.
Anyhow last time it was ridden it ran well with no probs.
Anything apart from seals is there any other causes?
One more thing whats the appox cost of sorting the bottom end if the seals are shot.
Many thanks

[Luders]

Is it using transmission fluid?

I have never just replaced crank seals before, so you'll have to check. A crank rebuild with new bearing, seals and rods is about £300.

Whilst it's out, you might want to consider doing the lot.