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oil and plugs for a '31 model 402?

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  • oil and plugs for a '31 model 402?

    OK so finally I'm riding the 402 and I notice the plugs seem cold (black & sooty). Anyone know what is the next warmer plug from a D16? Timing is fine and I've got the correct carb too.

    And can anyone recommend (from experience) what oil I should be running? It's ALWAYS 75-85 F out here.

    By the by, a word to the wise, IF the compression is good and you are still fouling a plug it is most likely bound up and needs gentle heat cycling to break it loose.
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