Kit 4ª Marcha 25T/25T MSX/SF Yuminashi

With the 25T/25T 4th gear sports sprocket set you're transforming the stock gearbox with serious overdrive characteristics in to a close ratio transmission with a 4th gear 1:1 sports ratio.

The direct result for a stock 125cc bike is that you can install a 16T front sprocket, which gives you instantly a longer first, second and third gear, and most importantly a 4th gear which picks up speed right away when shifting which means that your top speed will be finally higher in 4th gear then it is in 3th gear, and this each and every time you open the throttle in 4th gear!

YUMINASHI is selling this product with a very low margin to allow everyone to work the gear issue out and to get it straight the way Honda should have done it.

The 16T front sprocket, which you need to install with the gear sprockets, can be found over here.

If you are an engine tuner, then you also benefit seriously from getting the basics right because you will have right away a cooler running engine, able to run higher compression ratio's and again, no drop at all if you are shifting from 3th to 4th gear which is a serious issue with the stock 4th gear installed even with a big bore kit.

With the stock 4th gear installed you have a serious heavy load in 4th gear and bringing the load down with the shorter sports gear set will mean a serious reduction on engine knock (detonation).