Does anyone know of any issues with Yamaha OEM valves breaking? I called MXtime and they said that OEM yamaha valves are having alot of problems breaking off at the neck of the valve. I think he is just trying to sell me his valves. I have over 100 hours on my OEM parts on a 05 YZ450 now, I am getting ready have the valves, springs, seats replaced and need a reliable shop to have the service done, I already have all the OEM parts and need a good shop that will install all the parts and set up the head correctly. Anyone have suggestions.