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I have a 97 Merc 225 EFI XXL with 207 hours. Aprox. 20 hours ago the engine began making a clank,clank,clank sound that Ive been try to troubleshoot (mechanical or combustion) for quite some time now.<br /><br />Yesterday I finally removed the drain plug in the lower unit and the gear oil had...
97 Merc 225 EFI w/ 193 hours.<br /><br />During the past 20 hours the motor has been fouling plugs. I was using West Marine oil and I know that was a mistake. When I add new QL77C plugs and run the motor at 3500-3800 RPM for 30 min then check the plugs , they are very tan and not oily at all...