If your having trouble with increasing idle speeds, leaking oem carb flange is most likely your problem. The factory flanges were leaking between boot an reed cage creating a lean mixture. I was able to replace both of them for half the cost of oem and have near same quality. One concern is at bolt hole locations boot isn't flush with the rest of seal so be careful not to overtighten. I used a small amount of high temp atv red silicone as well to insure a good seal between reed cage and boot.