Forgive me if I brag a little bit on the most amazing thing that happened to me today on my bike. I own a 2007 Sherco 125 and have been riding since November. Never touched a motorcycle of any kind before that. It's been quite a learning curve to be sure. The main problem I've had is learning throttle control on the 125. It was such a big leap from idle to top speed, felt like it was all or nothing with no inbetween. Most of my rides were spent with me getting behind the throttle half the time resulting in some pretty spectacular crashes, with the other half spent stalling out because I was so afraid of giving throttle that I wouldn't give any at all. It got so bad I started looking for other bikes, not that I needed more power but I needed something that had a smoother acceleration. Otherwise it was only a matter of time before I was going to get behind the throttle at the wrong time and seriously hurt myself. The problem with getting another bike was that I have zero cash flow for buying new toys. So we had to look for another solution. Fortunately my friend Mike is also our mechanic, and he suggested putting a bigger rear sprocket on her (a 56 instead of the 48 that she currently had). The front was already on a 9 tooth sprocket, as low as it could go. I was a little dubious but at this point I was willing to try anything. Today was the first test, and may I say that the results were AMAZING! It cut her top speed (which was fine because its a trials bike, its not meant to go fast) without sacrificing her power response. The biggest thing is that her acceleration became gradual. Instead of rocketing from idle to top end, I was able to control the throttle. The best part was even when I wicked it wide open, I never felt like I was in danger of being left behind. Instead of overshooting hills and rocketing down lines without time to process and think, resulting in numerous crashes, I was actually able to maintain control and precision and hit some new lines that I never would have dreamed of riding even a week ago! And before anyone asks, I still had plenty of power to go up hills, and even a fairly steep bank with some wicked roots set into them. The other week when we tried it, I failed miserably. Today I went up them first time like they weren't even there. So if anyone out there is having trouble with their 125, I highly recommend this!!! I'm not a mechanic but speaking as an inexperienced rookie who needs a bike who gives her confidence and control, this made an astounding difference! I can't wait for my next ride and see what else I can learn to do now!