go to a merc dealer/shop and pick you up some mercury power tune in the spray can. take your plugs out. squirt the powertune directly in the cylinder till it foams out the plug hole. do that to every cylinder. let it sit for about 5 mins then do it again. then let sit for 15-20 mins then put old plugs back in. turn motor over with kill switch pulled off to clear the fluid. then fire it up and let it run for 10 mins and watch the years of carbon buildup drop in your driveway. get new plugs for it. you shoudl be good to go. i do that once a year to my 200 hpdi and it cleans it out real good and keeps it running like new. i started running ring free 2 summers ago and it reduced the carbon by about 85%.
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