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I have a 05 Trail Boss 330. The only way that i can run it is if i have the choke all the way on. If i were to have it off it just dies. I broke it all down to the carb and bought some stuff you spray in there to clean. But it still wont runn properly. Any idea on what else the problem could be ???
 

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take the carb loose, turn it over and make sure the air screw is set. alot of times due to vibration the screw will turn itself in and will run just as you described. The other thing ive seen problems with is the rubber intake the carb is attached to, make sure there isnt a crack in it. Hope that helps.
 

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Welcome to the board!
 
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