THE COMPLETE TOP END OF THIS ENGINE WILL GO RIGHT ON YOUR TIRED XR50 XR70 CRF50 CRF70 (1991_TO_1994_CT70) (1982_TO_83_PASSPORT) (Z50R_1982_TO_1999)AND YOU GET A NEW CARB, CLUTCH, FOUR SPEED TRANNY SET, CLUTCH COVER, KICK AND SHIFT PEDALS, ETC ETC