Vibration is a bad thing in mechanics.
And especially in engine, if an engine vibrates too much, it tells
that something is not veri good abt it. It may be underused,
overused or just not veri efficient.
An engine that vibrates too much may give u extra power but it may
not last veri long, hence the lower reliability.
I can give u a few examples but i tink 1 is enuff. Take the gears
inside ur engine. When you have excessive vibration, you may
accidentally widen the backlash. You might end up wif a grind
gear(toothless gear).
Personally, tw is a cool bike but it is not so reliable when you
campare wif other bikes. I believe you have got my opinion on the
relativity of vibration and reliability of a bike but its only
mine...