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I assume you mean you put in a "hotter" spark plug (Went from like a BPR9ES to a BPR8ES? I think your original problem was just "bad" plugs that needed to be replaced, as the difference in the heat range would not cause the problem you described.
 

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Yes Shawn - heat range DOES matter - but that has nothing to do with your problem. I think you proved that yourself since you replaced the plugs and the problem is now back :) . The 6's you had DEFINITELY were too hot for your engine regardless. R U sure you cleaned and re-assembled the carbs correctly? Any obstructions in the air intake? Had the machine sat for a while?
 
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