Hot Rods – Transmission & Engine Bearings, including transmission bearing kits for the Yamaha YZ 250 and YZ 125, Honda CR 250 R and CRF 250 R, KTM 50 SX and 50 SX Mini and GasGas MC 50, plus wrist pin bearings for the CR 250 R and 50 SX Pro SR. Gearbox and small-end bearings are the parts most riders forget until a dirt bike starts jumping out of gear, whining under load or losing shift feel. Grit that gets past a seal, old gear oil and hard clutch launches all beat the shaft bearings flat, and a dry wrist pin bearing will seize a piston and destroy a fresh top end in minutes. These kits supply the full complement of bearings for the transmission shafts in one box, matched to stock dimensions and clearances so shafts sit square and gears stay in mesh. Replace them during a split-case rebuild and you get positive shifts, quieter running and no guessing about how much life is left inside. That is the difference between a bike you trust on a rough enduro loop and one you nurse in. Send us your year, model and displacement and we will confirm the correct transmission bearing kit or wrist pin bearing for your bike before you order.