newbie here - I can pull start a lawnmower. (also took a 2 cycle engine apart, to clean grit out of it, and it still runs, 13 years later)
Is there a reason the head can't be pulled, and then spin the engine up to see if it's in gross balance ?
(hand crank, or motor drive)
if it wobbles around, do weights need to be added to the crank, or either/both flywheels
I suppose if it wobbles, and a chalk mark is successfully made, the weight gets added opposite the chalk ?