Got an 02 Sportsman 400, she cranks and idles, but not smoothly. Also, when I accelerate, it's a little rough and when I let off the throttle she'll backfire. I'm running some sea foam through it right now to see if that will help. Any input would be appreciated.

 

Try simple things first like changing the plug if it's been awhile,checking valve clearance,plus check/clean the air filter if needed.Water,old fuel can cause problems also,sometimes additives can help. If it doesn't help and you have good fuel flow then best to tear the carb apart. If you go to all that trouble just install a new carb kit.Don't just try to clean one.http://www.ebay.com/itm/2001-2002-POLARIS-SPORTSMAN-400-CARB-CARBURETOR-REPAIR-KIT-03-412-/360494309042?pt=Motors_ATV_Parts_Accessories&hash=item53ef229eb2&vxp=mtr