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TR4/4A Spark plugs
- Thread starter bammons
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CJD
Yoda
Online
Someone may have your same combination and have the perfect answer. In the mean time, I would recommend starting with the OEM plug and see how it runs. If it tends to foul or carbon up prematurely, move to a higher number for a “hotter” plug to keep the plug clean. If the plugs run for a while and come out chalk white, or you get detonation at normal timing settings, then move to a lower number plug, so it runs cooler.