u can buy it new still , $157 us at bikebandit so will be $350 locally , what i could do is sell u a complete clutch and primary gear from a yz 80 , will be higher geared , u would have to reduce the ratio at the final drive , and i don,t know if u can get a big enough rear sproket of or a small enough frount one primary ratio,s yz80 is 66/21 yz 50 is 68\19 steve ph 0412708957