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i have a js 440 all stock and slow as Christmas and found a 96 Polaris sl 750 for sale. the polaris is missing the tank but i wont need it and it is a 3 cylinder. just wondering if any one has ever tried this swap or know any pointers about it.

i bought me a 1978 js 440 a month ago and early this week tried it out and it ran fine toping out at about 25ish and then the end of the week went out agin ran fine first half the day and then it lost all its power were it wont even get on top of the water. i tried cleaning the spark plugs they...