Another tip is to take the spark plug out and watch for the piston to come up to the top of the cylinder. You can tell you are on the conpression stroke if you put your finger over the plug hole and the piston is pushing your finger off with the cylinder pressure
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What would cause the compression to build up inside of the flywheel casing I know is I have a little smoke coming out of the whole world my string is for my recoil starter if you can help I would appreciate it thanks