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Yeah pretty much any sled that doesn't have a JLO engine or a rotax which i'm really not familiar with takes a 9 heat range NGK plug. Like he said if you're fouling plugs than your too rich on the mixture (carb side) i run 9s in my 72 panther at 20:1 mix and have never fouled a plug. If it wont run on what it calls for then you have to adjust or fix something.
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