Their is quite a bit of science to the balance of a single cylinder engine. I took one of my 50cc Honda cranks and put it up on ways to see what Honda did. I then tried to duplicate it in the china engine. I ground away material near the big end and got the crank to stop with the big end straight out balancing the rod by the wrist pin straight out also. In a real balance there is a formula, you use a portion of the weight of the piston, pin, rings and rod. I just tried to get it the same as the Honda. Have fun Dave
PS: No it did not seem better.
Originally Posted by Riverdog
I have a 80cc on a stretch cruiser. So bad your hands get numbs at high RPM. Has anyone ever tried to balance a flywheel.