Timing issue?

The way to check your timing mark is NOT with your finger. All this does is to tell you what 'stroke" of the firing cycle you are on. To accuratly check the timing mark, buy or make a piston stop

I made this one and have had it since the early SEVENTIES

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To use, remove no1 plug and make sure (stick/ flashlight, etc) that the piston is down a ways, remove battery ground, and screw the sop into no1

Wrench the engine around gently until the engine stops against the device. Make a temporary mark onto the balancer directly under TDC. Rotate engine backwards until it again stops, make a second mark

Your true TDC witll be halfway between the two temporary marks, and if the original mark is correct that is where it will be