Originally Posted by Foot dragger
Those titanium valves have that hard coating,on a hard ridden 450 or screaming 250 once the coating goes away the valve needs replacing.
That was 1 adjustment session for an A class cross country CRF450R raced by a young friend,he did all his own wrenching and didnt want to take a chance on a DNF. He would adjust em once,run it till it showed signs of needing another adj and take it apart for R&R.
Pro Circuit has some nice valves,supposed to last longer go faster.
367.00 in actual American dollars for each valve.
I agree the 450r wasn't too bad a valve job once every year I thought that was fair but the 250f was hard to take a would get 100 miles after the valves went to 0 the first time and then the valves are junk, all intakes I did have a few DNF on the 250 because of the valves