Note

If the compression is low, the engine cannot be tuned to maximum performance. The worn parts must be replaced and the engine rebuilt.

Correct Spark Plug Heat Range

Spark plugs are available in various heat ranges that are hotter or colder than the spark plugs originally installed at the factory.

Select plugs in a heat range designed for the loads and temperature conditions under which the engine will operate. Using incorrect heat ranges can cause piston seizure, scored cylinder walls or damaged piston crowns.

In general, use a hotter plug for low speeds, low loads and low temperatures Use a colder plug for high speeds, high engine loads and high temperatures.

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