"7" colder plugs when I had

the fouling really bad.  But I also had fouling with the "9" plug

Perry Mick

Are these ND or NGK plugs? If so a LOWER number is HOTTER
Bill Jepson

Woops, think you are right, I had "9" all around, platinum. Went back to "7" on the leading
which is stock. Retained the "9" on the trailing, which is also stock.

Perry

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