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You could also try a fitting that screws into your spark plug hole, and accepts an air chuck. When you pressurize the cylinder, any leakage will be evident. You need to turn the crank to TDC to perform the test. Air rushing out the muffler is a leaking exhaust valve, air blowing back through the carb is a leaking intake valve, air coming out of the dipstick hole is rings. Expect some air to come out of the dipstick hole, because of the ring gaps.
You can make your own adapter by breaking the ceramic off of an old plug, and then welding or epoxying an air chuck fitting to the threaded body of the plug.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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