Is there a reasonable upper rpm limit for various builds. I got a digital rpm meter and put it on my 2011 tomos with the uni/biturbo/ upjet kit and i find it cruises at 9600 rpm when warm at about 37 mph. Is this a good idea for longevity ? Are the main bearing built for hours or minutes or moments. I typically ride for ten miles full throttle.
What about rpm with a pa 50 with original crank and bearings but a dellorto 42 cast iron upgrade or my Vespa bravo when I figure out how to make it go fast?
Is it just bearing temp that somehow we infer from another temp measurement? Or are these internals so nukeproof that rpm at the 10,000 level is inconsequential?