Size
Let us distinguish the important difference in spark plugs threaded ends. They come in four diameters and lengths. They come in nominal 14, 10, 12 and 18 millimeters diameters. Previously, there was a slight difference in thread configuration especially in different countries. However, the international standardization of the thread forms made it uniform. These new dimensions are now being followed by motorcycle parts manufacturers.
Usual Errors
There can be lots of error in selecting the best motorcycle parts especially in the case of spark plugs. The very usual error is using 3/4-inch plugs in 1/2 inch holes. The result of the same is horrible.
When the plug threads are exposed in combustion, they become filled with deposits. Consequently, it will be hard to remove the plug without removing the hole threads. Quite the reverse, if you use a short plug to a deep hole, the deposit will fill the hole and it will be hard to re-install the right size plug.
The worst error is the use of overly-long plug. The exposed threads absorb great amount of heat from the combustion process which improve the plug-nose temperatures. As a consequence, the...
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