THIS IS THE BOLT FOR THE ROLLER ON THE RARE ALUMINUM 90CC CYLINDERS SOME STEEL AS WELL FROM EARLY S90'S LARGE PIN USED ON THESE S90'S from serial: S90-111565 to serial: 142498 AND AGAIN from serial: S90-424487 to serial: 527510 329V @ *CAM CHAIN ROLLER FOR ALUMINUM CYLINDERS ON EARLY S90'S CL90 CM91 14610-028-000 1/22M (328H)USED ON THESE S90'S from serial: S90-111565 to serial: 142498 AND AGAIN from serial: S90-424487 to serial: 527510 328H