My klx450r has about 1500km of off road on it now and the inlet valves are screwed. The bike became very hard to start recently so i checked clearances and the inlets had none. So i re-shimmed 0.17mm smaller and finally they were back in spec. Now 3 rides later 0 clearance again. So i have pulled my head off ready for new valves. Should i go stainless? Are they the same as the KX? Has anyone tried different cams? I don't want to go too wild just a little more excitement.