Rear sprocket 39 teeth steel 420 Yamaha YB1 (50 - 1985)

39 crown teeth 420 Yamaha YB1

Transmission tray par used chain of origin for motorcycle 50cc Yamaha YB1 from 1985 to 1999.

Technical characteristics and dimensions of the rear toothed pinion

• Mark: Yamaha
• Drive train type: 420
• Number of teeth: 39
• Material: steel
• Colour : grey
• Number of fixing holes: 4
• Diameter of fixing holes: 8 mm
• Crown Fixing Hole Type: Smooth
• Fixing centers: 57 mm and 80 mm
• Inner diameter of the crown: 63 mm

It is essential that you you check the type of drive train you need before ordering. On small motorcycles, most 50cc use the 420 (width 6mm, center distance 12.7mm) but some 50s and most 125s use the 428 (width 7mm, center distance 12.7mm) even for 125 in 520 (width 6mm, center distance 15.8mm). All drive train parts, i.e. front sprocket, chain and rear sprocket, absolutely must be of the same type.