Hi every one new to kawai's and mimb. I just bought a 06 brute with 400 miles when I hammer it from idel it will spit and sputter and back fire a little until it winds up some. It also does the same thing at wide open going down the road. I have ran a tank of gas through it last weekend, thinking it could be bad gas , still does it . I'm guessing clean the carbs what yall think? and is there any thing else I should do right away? Thanks in advance!!!