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Discussion Starter #1 (Edited)
My son's 99 XC500 blows back oil into the air box. Enough that after a 75 mile ride, oil [a couple of spoons ] leaks onto the floor.
The reeds apear OK, no leaks from the oil lines, everything else is dry. Would appreciate some help or ideas.
 

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Discussion Starter #3
Exessive smoke

No machine does not smoke excessively.
Other info. that may help-- pistons look OK from intake,exhaust,& spark plug holes. Compression is 121psi both cylinders.
Work done approx. 1000 miles ago-- Rebored .020 " over with new Wisco pistons,& Boison reeds.
Hope this will help!
 
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