I agree with Maximo on the slug story.

I had a kangarooe engine that i snapped the crank, it broke were the screw holds the flywheel. I had a Crono RS7 crank that was not slugged. Modified it to exact same timingnumbers that the kangaroo engine had. That enigne was never any good until i got a new crankshaft with sluggs. It missed a whole lot of revs on top and i never got the speed out of it.

>With a new crank evrything was back to normal. Do not need no dyno to find that out, just another crank without slugs and a 360 degree wheel, ohh and a dremel, lol