Skip to main content

Free Shipping on Domestic Orders $75+

Compression Test

What you need

    1. Compression Test, Safety precautions: step 1, image 1 of 2 Compression Test, Safety precautions: step 1, image 2 of 2
      • Flip the power switch into the STOP position.

      • Make sure the engine is cool to the touch before proceeding.

      Ask FixBot

      Add Comment

    1. Compression Test, Remove the spark plug cap: step 2, image 1 of 2 Compression Test, Remove the spark plug cap: step 2, image 2 of 2
      • Pull the spark plug cap straight off of the spark plug.

      Ask FixBot

      Add Comment

    2. Compression Test, Remove the spark plug: step 3, image 1 of 1
      • Use a 5/8-inch spark plug socket to remove the spark plug from the engine.

      Ask FixBot

      Add Comment

    3. Compression Test, Check the spark plug for wear: step 4, image 1 of 1
      • Check if the spark plug is fouled and replace it if necessary.

      • The spark plug pictured in this step is in new condition.

      Ask FixBot

      Add Comment

    4. Compression Test, Connect a compression tester: step 5, image 1 of 1
      • Follow the instruction provided with your compression test kit to connect a compression tester to the cylinder.

      Ask FixBot

      Add Comment

    5. Compression Test, Test compression: step 6, image 1 of 2 Compression Test, Test compression: step 6, image 2 of 2
      • Pull the starter 5–10 times to build pressure in the combustion chamber.

      Ask FixBot

      Add Comment

    6. Compression Test: step 7, image 1 of 1
      • Read the compression gauge.

      • Pressure should read 125–165 psi (8.6–11.4 bar).

      Ask FixBot

      Add Comment

Conclusion

To reassemble your device, follow these instructions in reverse order.

Cancel: I did not complete this guide.

2 other people completed this guide.

Sam Omiotek

Member since: 02/25/19

100,571 Reputation

289 Guides authored

0 Guide Comments

Add Comment

View Statistics:

Past 24 Hours: 12

Past 7 Days: 31

Past 30 Days: 72

All Time: 1,120