After using an HF compression tester and getting inaccurate readings and then reading all the bad reviews about it due to inaccuracies in small engines, I bought this Lisle based on its reviews. I'm happy to report that this compression tester worked great for my 4hp outboard motor. I believe the reason this tester works where the radio frequency doesn't is because this device has a Schrader valve on the end of the hose where it screws into the cylinder head.
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