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Thanks. I will give this a try. I learn something new everyday.

Thanks. I will take a look and see what I have for access. I am beginning to think these are throwaway engines. What a shame.

This engine has no apparent impulse port unless it is built into the carburetor. There is no separate line. I will remove the carburator and see if there might be something cast into the carburator. So if I block off the intake and exhaust and pull a vacuum through the spark plug, is this...

I pressurized the cyclinder to 120 psi, blocked off the intake and exhaust and let it sit for 10 minutes. No pressure drop.

I have a small 33cc two stroke that will only run if I put some fuel in the sparkplug hole directly on the piston. Dies as soon as this fuel is gone. I have replaced fuel filter in tank, fuel lines, cleaned the carburetor, installed new plug, tested cylinder pressure (120 psi), checked crankcase...