Guys here is my explain!
This crank don?t vibes at all in any range between 500-8500rpm.
It have changed balance factor, not only trued!
You know vibes eat horsepower and kill engine.
You can?t outbalance a single cylinder engine,only put vibes somewhere it
pass very fast or for not so long period.
Stock balance factor is set for 5000 rpm ,for most of us never rev past that
rpm or for a very short time ,when you do MX.
This crank is heavier at opposite place were rod is located, because of tungsten is in that holes,not iron.
This crank vibes between 0-500 rpm or 8500 rpm and above.
So you can win 1500 rpm here and a lot of power without vibration!
Still worth it?
//doordie