My wife's bike has the fmf's with 28mm Kehins and head work, kind of close to your set up. Bike has very usable power band with real good low end. If your thinking of going up to a bigger carb keep in mind some other added cost to set them up. You might have to get new intakes, throttle cable?,new filters,jets,and possibly shop time at 45.00 per hour to get them set up right. The carbs may sound like cheap hp gain but after all is said and done it can double what you payed for the carbs. I have stock carbs right now and I am planning on taking them to a machine shop and have them bore them out to 28mm for about 80.00 or less. You'll get the same effect as the Kehins, you won't have to buy any other set up shit and you'll save alot of money to put somewhere else on the shee. Just my 2cents.