Gearbox sprocket nut upgrade. See the second picture showing nut fitted to gearbox. Fits BSA Pre-unit swingarm models A7 A10 B31 B33 Gold Star etc.
BSA A10 4 Speed Gearbox Sprocket Nut OEM: 67-3053
Yamaha R6 06-22 Gearbox Sprocket Nut. Genuine Yamaha, New (A10)
Yamaha R1 15-20 Gearbox Sprocket Nut & Washer. Genuine Yamaha New (b14E
Yamaha R6 06-23 Gearbox Sprocket Nut. Genuine Yamaha, New A10
Yamaha MT-09 14-25 Gearbox Sprocket Nut & Washer. Genuine Yamaha New (b14E
TRIUMPH 4 SPEED GEARBOX SPROCKET NUT SOCKET
