Thanks for that info, I dont think raising the oil tank would solve the problem, XL and XR's have the oil in the frame so should have a greater head of pressure to start with.
I meant the delivery pipe to the head, RS 600 flat trackers all ran a big bore feed to the head
I think the problem lies at the pump, it needs to be larger running at a lower speed, spinning a standard pump faster would lead to worse cavitation problems I think
You're welcome.
Good point you make re oil in frame versions. But if there is cavitation it will almost certainly be a problem on the suction side of the pump. You'd need to find a way increasing the effective head felt at the suction port to the pump. Or lower the oil temperature. Or both!
I don't know enough to say whether rpm of the pump is the factor. But if it keeps the localised velocity of the oil low in the suction line, then I guess yes, that would move in the right direction to avoid cavitation. As far as I know anyway.
I'm not entirely sure how you'd test for proof of cavitation. Severe cases show eventually as little pockets of erosion into the metal, local to where the cavitation has occurred.
High running temperature and off road machines kind of go together. The power demand can be high, but the speed of the vehicle not that high. Maybe!?