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Mariner 90HP 4-Stk
My boat is fitted with a Mariner 90HP 4-Stk engine. A few weeks ago I installed a Dohlpin Tail to the engine. Since then I have experienced a drop in the engines RPM, reaching now only 3500-4000 instead of the normal 5500-6000. In Idle the engine sounds OK. I have replaced all spark plugs and the Local Dealer have checked the engine and found nothing, yet the problem on the water remains. I noticed a greater vibration of the motor and transom while runnig. I haven't tried without the Dolphin Tail yet. Does anyone have experieced or heard something similar? Thanks
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