I have a chance to pick up a 41mm fcr-mx carb. I currently have a 07 WR450 with all the freemods and a correctly jetted 39mm fcr-mx carb. It's not that I'm unhappy with what I have but if this will give me that little more for just the cost of a jet kit I'm all for it. My question is are these bikes already fitted with the largest functional carbs they can use and run or can the extra air fuel mixture be utilized. I see no reason to but something on just to say I have it.