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A leak down test (pressure differential test) is far more sensitive when detecting air leakage. In addition it allows you to put your ear to the intake, exhaust/muffler, breather, or cylinder head to listen for the location of the leak. Similar sound info could be had by simply routing compressed air into your plug hole if you concoct a suitable hose. Leak down testers really don't cost much and you only need a small air compressor.
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