how to compression test a motorcycle

Best answer


To run a compressionteston your motorcycleengine: Remove all of the spark plugs. Turn off the ignition or ground the spark plug wires. Turn off the fuel valve or fuel pumps.

People also ask


  • How do you check compression on a motorcycle without a gauge?

  • If you don鈥檛 have a compression gauge, you can run a poor-man鈥檚 compression test by holding your thumb on top of the spark plug hole. If you鈥檙e able to keep your thumb on the hole while you turn the engine over, your engine has low compression. To run a compression test on your motorcycle engine: Remove all of the spark plugs.

  • How many PSI should a motorcycle compression test be?

  • Interpretation of Motorcycle Engine Compression Test Result: (1) The final result should be between 125 to 150 PSI per cylinder (refer to your motorcycle service manual for a more precise specification), and (2) On a multi-cylinder engine, the reading for each cylinder should be within 10 PSI of any other cylinder.

  • What is a compression test on a car engine?

  • 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. 鈥淭hey say鈥?the test should be done after the engine is warmed up.

  • 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.