OK my 06 crf250R isn't starting up easily anymore It also seems to have lost a good amount of compression. I've been looking through the forums and it looks like my valves might be tight so ill either be doing a shim kit or new valves completely. Any suggestions on the types of valves I should put in or if the shim kit will work okay? I also will more than likely be replacing the piston in it while since the engine will be already apart so any suggestions on that also? I appreciate all of the help and any tips or tricks you might have for me because this will be my first time taking apart an engine. Also a list of tools and equipment that i'll need would be much appreciated too.