how to compression test a motorcycle

Best answer


A Compression Test is pretty easy to perform – justthread it into the spark plug hole on the cylinder headOnce attached, open the throttle (and keep it open) and kick start the engine over and over until the compressor gauge reaches peak pressure.

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  • How do you check compression on a motorcycle engine?

  • Drop some engine oil down the spark plug hole. Attach your compression tester gauge and run the test again. If the readings come back higher than the original compression test, the low compression is likely due to the rings. If the readings don鈥檛 change, it鈥檚 likely due to your motorcycle鈥檚 valves.

  • What is a compression test and how does it work?

  • What is a Compression Test? A compression test measures the peak pressure in the engine鈥檚 cylinder as the engine is turning over or a reduced cylinder pressure value if the engine has a decompression system. There are two different ways that you can test the engine, warm or cold.

  • What is the best way to test a motorcycle engine?

  • There are two different ways that you can test the engine, warm or cold. 鈥淭hey say鈥?the test should be done after the engine is warmed up. This allows for the bike to reach operating temperature and give a more accurate compression test.

  • How do you test a bike with a decompression system?

  • In order to do a test on an engine with a decompression system, you must remove or disable it. If you are working on a bike with a decompression system that bleeds out cylinder pressure as the engine is kicked over, you may want to perform a leak down test instead.