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I just joined so I could post on this one......lol.......I got a rotax 399cc jammed into an old Jag.....and found the best way to get that lump of steel spinnin was to rebuild the Tillotson Carb (hr40).....the little check valve under the weltch plug, has to move freely, and be totally dry as to not stick (this will prob fix your idle problem) .....gasket kit and exploded carb pics available through WINDEROSA....check out their site if you havent yet.....as far as cooling your cart project, what about an electric fan from a car??? as mentioned before, maybe you could make a shroud to boost the little one in your engine....
 
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