Wow,

There must be something wrong. Prop out of balance? Center hole in the prop not centered in the prop hub. I have never seen one break bolts like this. Those are larger bolts...I use 4-40 bolts or 3mm Bolts to hold my engines in place.

The other possible solution is a bent crankshaft. However I doubt that is the case on a new engine.

Perhaps you should it to YS Parts and Service along with the prop you are using...

Or check the balance on the prop that you are using.


Troy Newman
Team YS