Are you saying it.s best not to use light and set to 8 degrees? And time the motor high enought so it will crank okay? And what differnts does the RPM and haet on motor make? The piston will be in the same position no matter what will it not? Now I did have my motor timed by ear. I timed it where I would have the most rpm and still crank. When you put a light on it, you could evan see the line. Then I set it to 8 degrees[ 4 marks on the A side] and locked it down. But when you crank motor, it does skip, and white smoke comes out out tail pipes. And when it wrams up, it smooths out and stops smoking. Do you think it is timed to low? And I should step it back up? Thanks, John.