High-resistance plugs and tester.


Many times starting problems can be traced to spark plugs with high resistance. The high resistance of the plug can make it very difficult for the magneto to fire a spark, especially at lower starting rpm. Long-term wear of the magneto points can become a problem as well. The plugs should be checked at the annual condition inspection, every 100 hours, or whenever starting problems are noted. Tempest makes a really nice go/no-go tester, but you can use a normal ohmmeter as well. Resistance should be less than 2K ohms when tested across the center electrode. Most new plugs will indicate around 800-1200 ohms.

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