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OK.  I went for an unconventional solution and shortened two Champion D21 plugs.  They are a very “soft” plug so ran lovely and clean in our Flyer for several hundred miles without a hitch.   Thus, they should be ideal for the Super. I don’t see why shortening them would impact their performance but it is going to be easy enough to find out.  Anyone else done this?  If not, I wonder if its worth adding the details in Yowl.


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