I've had a 300ex (wifes), 400ex with stock carb and put on a FCR carb after I put in the 440 kit, an 05 trx450r, and now a 06 trx450r. I guess I am used to this type of carb already. I bet you if you get out of the habit of snapping your throttle you will fall in love with this quad. You can't quickly snap the throttle from low RPM's with this carb and the way it is set up. There is no need to snap the throttle very quick when riding just "roll" the throttle on, fast if needed, but smooth. "Rolling" the throttle on smoothly provides more than enough fuel for maximum horsepower. As most people know this is the best carb for this motor and I'm glad Honda finally put it on the quad stock but there is a reason why they put crappy but great starting and easy to manage carbs on quads. They want to make them start and run like your Honda car. But now we are getting to the point where this carb is necessary for maximum performance and you can't blame them for doing that. You will be used to it before you know it. I never have to think about my throttle when riding. Bump your idle a little more if you tend to stall and keep the R's up a little more than you did with your EX. This motor is a little more high strung. Hope this helps!