I'm curious if anyone is balancing these engines? I am considering modifications to the piston on my 25cc poulan/featherlite engine. Since it has a single sided crank shaft, the con rod is easily removed, making balancing fairly simple.

What do you use for calculating the bob-weight? 50%?

Can it be done with some fair amount of accuracy by balancing the assembly like we do with a prop? I know automotive shops spin the cranks on big machines, but I would at least like to get this thing in the ballpark.

John