I should have my head with new intake valves back on Monday. When I go to reinstall everything do I have to make my best guess with the shim size and then measure and reinstall new shims if needed? Or is there a certain size that you use when you put a new intake valves?
I am new to riding and took my 2006 crf450x in to the shop to be serviced. I am told that my intake valves are done and its time to replace them. This shop is saying that when you replace your intake valves you should also put in a new piston. I would like to get your opinion on this. What risk am I taking if I don't do the piston? Thanks!