That is horrible man I would cry. But I use ngk on everything. My bike engine for pro racing are 14.5:1 and they work great. My lawnmowers weed eaters everything that takes a spark plug I use ngk. For your app you would need about a 8 or 9 heat range. Higher the number the colder. I think a 7 is stock. My bikes rev limit is set for 13k rpm so thats my exp with plugs.
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