I'll bet the beer, the carb is flooding out as mentioned. I wouldn't buy a kit until before a real good cleaning. If it was me I would only buy Yamaha parts if needed. I used a moose kit on a alt of mine cuz that's all I could get and she doesn't run the same, not bad just not the same. Oem is still there, ie timberwolf minus the jets. I cooked a air filter on my dx , cuz the air screw had worn and settled at rich setting. It would not stay at the proper setting and vibrate back. Bought a new air screw and whalla all good. Start with the simple stuff like muthy and Doug said. Hope it helped
"If you are going to piss like puppy, Don't Get Off The Porch"
Trikes:
84' Suzuki ALT185 (old Orange)
85' Yamaha 225DX, piped and spaced ( First Girlfriend)
Quads
87' Yamaha Banshee, built and very very fast (The Whore)
01 Yamaha Raptor 660, built and piped (The Beast)
03 Suzuki Vinson, 26's and piped (The Crowd Pleaser)
Once apon a time:
85' Tecate 300 alky flattacker, 6 in over swingarm, 88 Suzuki 500"Quadzilla"PIA , 91 Yamaha Warrior Built and Modded. (luved that Baby Tank)