Motorcycle: If a bike has low RPM, does it mean it is less smoother than a one with higher?

Like Honda CBR 250R, it has a RPM of max 12. Kawasaki Ninja 250r has a RPM of max 15… So ninja goes smoother? Just because it has higher RPM or because it is a twin cylinder?

T
The CBR 250 is a single cylinder engine the Ninja 250 is a twin cylinder engine and that makes it run smoother.

No

Smoother depends on how balanced the engine is. I don't know the Honda, but my Suzuki LS650 was ridiculously smooth. My other long ride was a '82 Suzuki GS450E. IMHO, the frequency of the vibration matters more than the amplitude -- the twin had a vibration like a dentist's drill, the thumper had the vibration like a cheap motel's massage bed.

No.

the factorys have to set the rpm limit somewhere, some set it maybe at 12000rpm, some at 15000rpm but that doesn't mean the engine with the 15000rpm limit will run "smoother" and more lasting.
the rev-limiter can be removed and then the engine that prior was limited to 12000rpm can then rev at 15000rpm too.

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