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In cold weather the hotter plug would be advised. That is nother question I had for you. When ambient drops drastically then the plugs will need to be changed to compensate. I'd try a NGK BPR8ES, they are only $1.50. I would hate to experiment with $15.00 plugs. There is nothing wrong with sticking to copper plugs either. Platinum was the in thing years ago but is being replaced by iridium. All NGK platinum plugs are now superseded to iridium plugs as iridiums is a better conductor than platinum. at the power you state I would think 7's would be too hot but then again how cool is it where you are?
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It changes from time to time.....
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