Yamaha YFM660R Raptor (2001-2005)
I have a 2003 raptor 660r. The first time i rode it it ran like a champ, after i got it home it started sputtering and backfiring. I cleaned the jets and carbs. It idles just fine, but when i give it throttle is when it backfires and sputters. Does anyone have any ideas what might be the problem?