Hermit,

I use a "leak down tester" that is made up of plugs for the exhaust ports, as well as a blank plug for one intake opening, and a plug with a pump and pressure gauge attached to it for the other intake opening. This form of testing does not need a lot of pressure. I generally test up to about 7 psi, and make sure the engine doesn't leak for a set period of time (useally 3 minutes).

I perform a leak down test with the spark plugs in the plug holes.

You can get a leak down tester from Motion Pro (2-stroke style), or you can make your own from parts found at hardware stores, and medical supply stores (the pump is basically what is found on a blood pressure testing cuff).

Thanks
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Charles Gallant