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Message: [QUOTE="nikki, post: 1261492, member: 18126"] I have a few friends who had '04 CRF250's and the intake valves tightened over time (like after 2+ years). Just keep an eye on the clearances every 10 hours or so, and if they tighten, just drop in smaller shims. If you reshim 2-3 times, then you are usually due for new valves/springs. You'll have to check the valve clearances regularly on any 4-stroke MX'er. It's not very difficult, and only takes about 30-45 minutes to check. I have an '06 CRF250 which I have raced for 2 years, and the valves are still in spec, never been reshimmed. [/QUOTE]