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Everything Dirt Bike
General Dirt Bike
4 strokes valve work
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<blockquote data-quote="snowflake" data-source="post: 165546" data-attributes="member: 152"><p>04-08 CRF250R's are the hardest on valves. I have one. I don't have a total hour count on mine but I bought it summer 2012 and promptly put an hour meter on it, after 15 hours (mixture of mx and one really fast desert track I spent over-revving for the entire race) the intake valves were trashed. I had stainless steel valves installed last year, I'm about a season and a half in on that work and its still going strong with the valves in spec (haven't adjusted them other than for the fact that I changed camshafts)</p><p></p><p>Good air filter maintenance coupled with keeping it off the rev limiter and you can easily see 100+ hours out of a set, and their are aftermarket solutions, one is the stainless steel route I went, which adds weight to the valve train so it will rev a little slower. Then there are companies like Fast Heads that offer revised valve seats (different material) that claims to have also fixed the problem.</p></blockquote><p></p>
[QUOTE="snowflake, post: 165546, member: 152"] 04-08 CRF250R's are the hardest on valves. I have one. I don't have a total hour count on mine but I bought it summer 2012 and promptly put an hour meter on it, after 15 hours (mixture of mx and one really fast desert track I spent over-revving for the entire race) the intake valves were trashed. I had stainless steel valves installed last year, I'm about a season and a half in on that work and its still going strong with the valves in spec (haven't adjusted them other than for the fact that I changed camshafts) Good air filter maintenance coupled with keeping it off the rev limiter and you can easily see 100+ hours out of a set, and their are aftermarket solutions, one is the stainless steel route I went, which adds weight to the valve train so it will rev a little slower. Then there are companies like Fast Heads that offer revised valve seats (different material) that claims to have also fixed the problem. [/QUOTE]
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