I have a 2005 crf250r. I was having and i still am having very bad problems. I just had my valves replaced. I took my bike out for half of a day it just dyed as if my shims were bad. I have no clue on how to fix this issue so anything would help. I did take it to a shop to get replaced and this is what happened. i don't know if its the shop fault, because they have never gone out so fast. please help me with this issue.
-Michael C. White