Rockers
The XR600 '92 of a freind of mine has the following problem:
Returned from a trip with a funny sound from the head, replaced camshaft, four rockers and camshaft bearings. The sliding sufaces of the rockers were caved in the wrong way a few millimeters.
Then, after the next trip, basically the same happened, but only to the two rockers on the left side. As well, the 'secondary' rocker of the left exhaust valve was broken in two.
Does anybody know what could have caused this? Lubrication seems ok; when one of the valve covers is removed with running engine oil sprays out lavishly.
Auke
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