I was curious so I bought the FCR35 carb for my KLX. It does make a huge difference in acceleration. I think I can get up to speed twice as fast as with the CVK - no exaggeration - and it has all the power when I need it. My riding though is mostly really tight single track trails and gnarly hills and the tractibility of the CVK is awesome. I'm sure my skills are lacking since I've only been riding dirt for about a year and I'm thinking I may have a gearing issue too, but I put the CVK back on for now. My question is to others who have the FCR. Is it just my skills at this point or do you think the the CVK will always be better suited for my riding? I put the FCR back in the box for now, but will definitely put it on if I will be around a track or open trails.