Plug Gap on NGK 4091?
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Plug Gap on NGK 4091?
For those who are running the NGK # 4091 (R 5671-A7) plug -- what gap are you using?
I set mine to stock (.050) but looking at the length and shape of the ground wire, it looks like these plugs were designed to have a smaller gap.
I set mine to stock (.050) but looking at the length and shape of the ground wire, it looks like these plugs were designed to have a smaller gap.
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