Question about 1993 Harley Davidson XLH Sportster 883

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Compression test on a 2004 polaris scrambler 500

I need to know how to do this from start to finish please.

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  • Anonymous Mar 31, 2014

    Compression Test



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Take out one plug at a time and insert compression gauge. turn the engine over until the gauge reaches its highest point. Reinsert plug and do the same with each plug. The readings should differ no more than 15 lbs. if they do pour about 1 tablespoon of oil in the low compression cylinder, if it raises it to normal you have bad rings if not you need a valve job.

Posted on Jan 23, 2009


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How do you check compression on a 2004 polaris scrambler 500?

Polaris or Sportster the procedure is the same:

1. Run the engine to warm it up to normal temperature.
2. Disconnect and remove both spark plugs.
3. Screw the compression tester into the spark plug hole for either of the cylinders.
4. Hold the throttle open fully, also make certain the choke is open. This is important to get good readings.
5. Crank the engine until there is no further increase in reading at the tester gauge - about 10 seconds of cranking should suffice. Make certain the battery is fully charged to get accurate readings.
6. Record the final reading
7. Repeat for the other cylinder

The difference between the two readings should not be more than 15%.

Jan 21, 2009 | 1993 Harley Davidson XLH Sportster 883

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