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I have a 1976 9.9 merc. I picked it up at a garage sale $40.00. The endgine is like new according to the repairmen. I had to replace the coils but am having trouble fouling out the plugs. I have dumped the gas mixed it again this time with synthetic oil. It runs great for awh9le then fouls the plugs. Do they make hotter plugs or do I have another problem???
 

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I would call over to tracker at bass pro and ask for Tim he can tell you what you need I think the number is (720) 385-3569
 
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