oil problems

[professorfrink7]

my 400ex is burning up alot of oil lately. the last few times ive gone riding i will go through about a quart every two hours. i checked for leaks and didnt find any. I need some advice as what to do about burning through so much oil.

[Chino886]

Originally posted by professorfrink7
my 400ex is burning up alot of oil lately. the last few times ive gone riding i will go through about a quart every two hours. i checked for leaks and didnt find any. I need some advice as what to do about burning through so much oil.

maybe new piston rings.....is your 400 smoking?

[400exrider707]

Ok well you said yourself my 400ex is burning oil, probably needs a new top end. Rings, piston, possibly overbore depending on how bad the cylinder looks. Simple job;) Also replace the valve seals as they are cheap and something that should be done.