Catastrophe

[art miller]

I there a correlation between running the engine at high RPM's and valve clearances? By high RPM's I thinking over 5500. Some people like to run up the RPM's through the gears. I typically shift in the 3000-3500 range. I have never run up to red line! Just curious.

 

[RaYzerman19]

Wish I could find it now, but a few years ago there was a video of an engine being revved up to 14,000 rpm, showing the valve train..... freakin' mind-boggling amazing!.... at the high end of the rpm range, the ability of the valve springs to close the valve is important, as float is not going to allow proper compression cycle, or you can imagine the damage in an interference design engine (valve hits piston)....... that's why most motorcycles don't have hydraulic lifters. However, in the FJR's case, I don't think you have to worry about any issue with it. The rev limiter will kick in........