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Everything Dirt Bike
General Dirt Bike
4 strokes valve work
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<blockquote data-quote="SRAD97750" data-source="post: 165523" data-attributes="member: 425"><p>It comes down to maintenance.</p><p>When the "change of clearance over time" leads you to believe the valves are stretching, or the valve seats are wearing.</p><p>You check clearances every 5-10 hours and record the measurements. When it starts to look like it's wearing at a faster rate than normal, then you could need valve work.</p><p></p><p>100% depends on each rider and application. I know folks with 100K miles on their sportbikes without adjusting the valves once. I have heard of CRF250F valves needing overhaul after 30 hard MX hours. -BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 165523, member: 425"] It comes down to maintenance. When the "change of clearance over time" leads you to believe the valves are stretching, or the valve seats are wearing. You check clearances every 5-10 hours and record the measurements. When it starts to look like it's wearing at a faster rate than normal, then you could need valve work. 100% depends on each rider and application. I know folks with 100K miles on their sportbikes without adjusting the valves once. I have heard of CRF250F valves needing overhaul after 30 hard MX hours. -BIG DAN:thumb: [/QUOTE]
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4 strokes valve work
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