Polaris sportsman 450
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First off they don't run good with the air box off. Might be time to check the valve clearance even though most of the time they're pretty close. .006 intake and exhaust. If this doesn't help then may need a carb kit, or at least a new needle and seat.Just cleaning carbs doesn't always solve problems if parts are worn.
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I'd definitely get a carb kit. Plus always check the spark plug color after you install a different needle and jets from kits like Dyno Jet,etc. Plug needs to be light to medium tan color. http://www.ebay.com/itm/SHINDY-CARB-CARBURETOR-REPAIR-KIT-POLARIS-06-07-SPORTSMAN-450-03-414-/291076927228?pt=Motors_ATV_Parts_Accessories&hash=item43c5896efc&vxp=mtr
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#8
You have the BST34 Mikuni carb on the 450,much easier than the BST40. Several videos on this.Plus a cheap 5 buck manual can help with this and other repairs.2006 Polaris Sportsman 450 Service Manual PDF Download
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