When i first bought the bike i was surprised on how it didn't have as much power as i thought. It lead me to look at forums and saw all the free mods and such. I also stumbled upon this kit and found out it comes with the better jets and throttle stop and bought it. I just installed it today and did some test runs. It is a different machine now. I am now able to pull wheelies in 3rd gear in the grass. It was difficult to pull a wheelie period before. With the wr throttle stop, the slide in the carb would only open half way, i put the new yz throttle stop provided in and the slide will now open all the way. just being able to open your carb all the way is a great improvement. If you buy this kit you should also purchase a fuel screw to fine tune your bike. It is impossible to adjust without rotating the carburetor. also i think i will have to do the ap mod to get rid of the bog when i crack the throttle. Other than that is runs great!