Balance a Burtz

[johnneilson]

Spinning bob weights on the crank do nothing you cannot simulate the offset acceleration of the mass between tdc and bdc

The best you can do is make the rods equal weight and end to end
Pistons even weight and as light as you think you can get away with

Just an observation over the years is that hopped up motors will shake and those not familiar with them think it is out of balance

If your motor is only making 45 hp it should be smooth when you get to 200 hp it will shake

J