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Forget the balloon.
As suggested by others put your finger over the spark plug hole and check for compression.
Try starting fluid to see...
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Brian, do it the old fashioned way, just hold finger over spark plug hole and spin engine over and then check the other cylinder, and...
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Does the compression gauge have a working check valve?
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Terry:
PM me if you want a module.
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You can buy these, but if you know someone with a 3D printer you can make them. I made a few of various heights. For 4 or 3 jaws. The...
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I guess the bottom line is you need to design the engine (crank and cam) to suit what is possible / required for the ignition you want...
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