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    Spark Plugs 40 Hp 4 Stroke

    Its a 2006, Yamaha of course, 4 stroke I am putting it away for the winter and thought I would check the plugs so I can plan on replacing next spring IF needed. Pulled off the plug wires and looked inside the hole and there is a C shaped what appears to be rubber around the base of the plug. I...
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    Old Guy New Here with Yamaha

    Lot of experience with engines, cars, trucks, tractors, lawn equipment, motorcycles and snowmobiles. Purchased a used Pontoon with Yamaha 2007 4 stroke 40 Hp and just got done replacing the water pump. Test run on muffs and in the tank with strong flow on all and headed out to the Lake again...
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