by holty » Mon Sep 24, 2018 6:16 pm
af close ratio 4 speed is a good box, its based on an indian gp200 gearbox, it uses the 3rd and 4th gear from one, the other 2 gears are closer together than the gp 200, i like these, ive just fitted one on my latest build, you get a long first gear much longer than your 125 box, then the gears are close together, great if you have a powerband, i dont suppose you will with that pipe, but you might be able to pull a lower final drive ratio as you will have a lot of torque, and the gap between gears is small, ive used a 19 front and 46 basket giving a final drive of 4.89 in top gear, yours might pull this , you may have to try it. af sells all the parts seperately as well if you break anything, ive had to replace a cluster on my rb250. the close 5 speed has i belive about the same ratios for gears 1 to 4 and has 2 options for gear 5, costs a lot more money though. all in all af 4 speed great box when you get the final drive ratio to your liking, and riding style
holty