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I have a 1994 sportsman 400
When I resistance when going up a small incline or snow bank I lose power any ideas?
 

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Now it sounds like a lack of fuel or if running like the choke is on, too much fuel. Since it's a two stroke, it could be the piston seizing in the cylinder. Does it run fine cold and then lose power when hot? If yes, then have the cylinder checked - if no, then check the compression and have the carb checked - what kind of fuel are you using, is the oil injection hooked up and what kind of oil do you have in the injector oil tank - if you are premixing, what ratio are you mixing the oil at, what kind of oil and what kind of fuel? Is the air filter clean?
 
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