
So NGK makes special spark plugs that are used in Wankel engines. So I suggested spending a few bucks more and buying NGK connector cables based on the idea that they know how to do them right. They fit perfectly and you can feel that the metal contacts inside interact positively with the plugs and coils. You are very good; light blue silicone case with plastic protection (this wire loom) for the most part. The plugs themselves are labeled "1" and "2" on each end for convenience.

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