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[Revband]

Yes definitely not an adjustment problem, something is seizing when hot,

[Flick5848]

Thanks guys I'm with you now. I'll try and investigate tonight. What's the cure for a tight rocker? Lapping in with fine valve paste ?

[nickbarber]

do the rocker blocks up without the rocker arm fitted, and with a telescopic gauge, measure the diameter in a few spots and find your average. now measure the rocker arm bearing face with a vernier. compare your tolerances in cold/running temps. an easier way of finding out if your rockers are binding, is to manually rock your rocker arms back and forth with your fingers at eng running temp *may require removal of pushrods*. cant see how a normal functioning rocker assy would bind at high temps though.. check to see if sufficient amount of oil is reaching bottom rocker block bearing surface.

[Flick5848]

Had the rockers off tonight and I can see some slight scoring to the bearing blocks. The more immediate problem is that a part of the exhaust rocker has snapped off. There is a little piece of alloy missing at the very bottom near the o ring. Its very thin in this area where it has been machined for the o ring groove and I could see the o ring being forced out. The rocker was nice and wet so it must have been making a seal. Anyway there is no point in carrying out any further investigation on these rockers so I will order a new set. Rockers have a sum total of about 500 miles on them and I shudder to think how much money I have in this old thing now but to does make me smile every time I look at it or ride it.