really dirty crank bearing!!

[kyser777]

today I splitted a 87 kx500 engine it was smoking like a train.
this is how looks the crank bearing, the crank and the crank chamber is full of black oil with some hard black particules

I suspect a worn crank seal

tell me what do you think?

[KXDINO]

you hit the nail on the head. allways good to change gear box oil regular to flush out the gear and clutch particals and use a good 2 stroke oil , side note i see so many 4 stroke owners leave there oil changes so long then they wonder why they are worn out . one bloke had a suzuki pe175 , dropped the bung nothing came out it was like thick sludge and he wondered why the clutch was toast.