vivivivivibration

There are people who have run the wrong flywheel on the steel internal cranks and they say they will start up and run ok, but when they get up around 2,000 rpm it shakes to beat heck.

j.d.duggan can you elaborate on where the worst of your vibration problem is coming in at on the rpm range. At Start Up? 2000 rpm, 3500rpm? Under Load? No Load? After warm up, Cold starts?