How can you make a good bike even better? We've come up a kit that makes the KX 250F or the RM-Z 250 even more fun to ride than they are now. The Carl's Performance KXF/RM-Z 280 big bore kit adds not only gobs of low-end power, but an even smoother delivery across the board. Who wouldn't want an even easier time cornering or accelerating off jumps? This kit is ideal for vet class racing where engine size is not a factor. The flickability of the 250 chassis combined with the 280cc engine make for a potent combination.

But this kit is not just for the track. This kit has been trail tested in the desert, mountain trails and deep woods. The ultimate fun trail bike! If you are tired of dragging after hours in the saddle, the 280 will enhance your trail experience without the added weight of a 450.

Kit includes our big bore cylinder, new piston kit and all necessary gaskets for simple bolt-on assembly.

Price listed is with approved cylinder exchange.