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The most accurate way to check your coils is to measure the arcing distance. The arcing distance should be a minimum of 6mm. This would require a special tool to measure the arcing distance.

You can also determine a coil to be defective by checking the resistance of the windings. You will have to check both the primary windings, and the secondary windings.
Specs are as follows:
Primary windings 2.3~3.5 ohms
Secondary windings 12,000~18,000 ohms


To check the primary resistance connect a multi-meter (set to the proper ohms setting range) to the 2 spade connecters on the coil.



To check the secondary resistance connect a multi-meter (set to the proper ohms setting range) with one lead on one of the spades (doesn't matter which one), and the other lead connected to the spark plug wire.

If the coil doesn't fall into spec on both the primary and secondary resistance tests, you have a defective coil. If the coil does fall into spec on both resistance tests, you still haven't 100% confirmed that the coil is good without doing the arc test. But if you check for spark at the plug, and it looks blue and healthy, then more than likely you have a good coil.

Note:
When checking for spark at the plug, you should have a plug in the spark plug cap grounded on the engine, and a "dummy" plug installed in the spark plug hole.
 
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