I've posted before the problems I've had with the valves on my CRF250R. I found a guy who said he had a fix, he did the fix and I wiped out big breaking my collar bone.
I was hoping to ride it a bit more and post that the fix really worked but cant so here is a summary.
Original valves went after about 40 hrs. Right intake lost clearance and the valves were damaged. Exhausts were ok.
2nd set lost clearance after 4 rides. They were installed by a very well known and experienced wrench.
3rd set TXM did the fix, replaced the intakes and exhausts.
Rode 3 times hard and the left intake went down to about 4.5 thou, the right was spec.
Rode 2 more times and the left intake went to 4 thou, right was still spec.
Took it back for a shim on the left intake and rode twice before my crash.
This guy did the fix:
Ted Greenwood txm racing engines - 705-435-3898
He wont say what he does but i am very happy so far. his price was very reasonable and he is really into engines and HP.
He has taken an inside look at a 05 engine ( Walton )and his first thought is it isnt fixed. NOT good news as i wanted an 05.
I recommend you guys contact him if you have had the valve problem.
cheers typing with one hand sucks