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spark plug ?

17K views 22 replies 15 participants last post by  quadman15  
Ya made me look! I have a CR7EIx that I havent put in yet. Its late, and Im too lazy to look up all the letter designations, but I bet this topic will have some interaction. Maybe our altitude and temp warrants a different plug than lower elevations. I know the 7 is hotter than an 8, and e means extended tip.