Hegar Sprag Hub for 1.25″ rear axle — acts like 1-way bearing so there’s no engine-braking and shifter or other engines act like regular clutched karting engines. (4) rear gears (21t,22t,23t,24t) included. Used 4x, gears new. Get it in time for DAYTONA!! I’m Going in different direction…. $350 shipped