John Basically you have to seal up the engine and then pressurize it. As Greg stated earlier, by blocking the exhaust and intakes with some kind of airtight method.. Home-made plates sealed with old inner tubes can work. I use a small hand pressure pump with a check valve connected to the crankcase impulse port ( same place fuel pump line goes ) I'll pump it up to about 10 psi and use a soapy mixture and check for leaks at ALL seals and gaskets looking for bubbles. 2-cycles do not like air leaks!!! This is a pretty standard thing to do on 2-stokes, anybody who works on them would be familar with it. Dave Phaneuf
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