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Old 05-03-2013, 01:59 PM   #2740
Beastly Adventurer
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Joined: Jul 2009
Location: Muk, WA
Oddometer: 2,941
Originally Posted by Foot dragger View Post
8 years on one set of valves,dang the guys who race em around here go a rebuild a year,then the head is ruined at some point along with the crank,then the cases can crack on a hard ridden race 450 or 250.
I know, reading Thumpertalk about those CRF horror stories used to scare me! But the valves stayed in spec and it was 8 years till I ran out of thinner intake valve shims. The clutch plates lasted 8 years too, with a Rekluse autoclutch. Now I did only race Supermoto one of those years, the rest was trail riding and some track days. I really think the combo of leaded fuel and not hitting the rev limiter was the secret.
"If you ain't slidin', you ain't ridin'"

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