Originally Posted by Yellow Pig
Looks kind of like the valve seals to me. Now if it is the valve seals I'm I better off going a head and doing the wossner piston kit w/ the better oil rings and be done with it or just reuse the OEM piston and rings?
My 2009 EXC450 looked exactly the same at 175hrs and was sucking oil like a hungry baby at the bottle! It was an oil burner from new, KTM even put a new piston and rings in at 20hrs. I did the re & re but had Dave Hopkins (djh on KTMTalk) check the bore and go thru the head. Oh yea,my compreesion ring was in three pieces?
My bore was basicly perfect, just select the right size Wosner piston, size the rings and assemble. Dave feels that touching the bore is pointless (unless their damaged or out opf spec) on these plated cylinders.
Dave cleaned up and checked the head, installed new valve seals and opened up the oil pasage in the rocker arm.
My bike now starts and pulls great with no oil consumpion. It was the best $600.00 bucks that I have spent on a bike!