when I first got my quad I was running a stock carb with a vitos 240 hmmmm jets well the main was a 340 and the pilot was a 32.5 and it ran fine like that but you can definitely tell it wasn't what it should be ya know,now I got a keihin pwk 35 airstriker nag I got it from jetrus for less then $180 shipped that's the best deal I've found not even eBay has deals on new cabs like that,I recommend a new carb bud,at least a pwk28 and you can get them cheap alot of the 85cc race bikes have them or just get a oko there pretty cheap and work good.