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When to rebuild?
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Posted by: 00Banshee

At what PSI of compression should I start to worry about replacing the rings on a piped but otherwise stock 00' 400 EX?

Posted by: stocktires

Well, Im kinda guessing here, but On R's is good to rebuild, or atleast re-ring when its 10-15 psi lower than what it is new

Posted by: 00Banshee

Thanks so much for your reply.

Posted by: timewass

The Clymer service manual says that it should be between 100 - 128 PSI. So I would say if you go below 100 then time to open er up.

Posted by: Castor-426ex

yeah generally youll be able to feel the power loss...most of the time...while youre in it might as well put a higher compression piston in it...lol