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Arctic cat 366 smokes blue


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I bought a 2008 arctic at 366 with 120hrs. When i red line it in neutral is smokes blue a lot. When I put it in high range it has problems getting over 35km/h. I bought it and had to clean the carb. It ran ok after i cleaned it. Not I have this problem. 

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air rulers fine. I cleaned the carb again and just before the carb there is an air box. The box was FULL OF DIRT. I cleaned it out and it runs great but still smokes blue. I'm thinking sand or dirt got into the cylinder and scored the cylinder walls. 

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