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Message: [QUOTE="njkx, post: 1264472, member: 53354"] I have an 05 yz250f. I check the valves every 20hrs or so. I am a total novice mechanic and it takes me approx. 1 hour start to finish to check them. The bike has around 60 hours on it and the valves are just now getting on the tight side but still in spec. I change oil frequently and am rarely on the rev limiter. C class Vet rider...mostly practice for fun and a couple of races per year. If you are only riding once a month and you are up North (not riding indoors) I don't see you having to check the valves more than 2X per season. [/QUOTE]