JT Sprockets

Online Catalogue

Yamaha YZ125 E,F

1978 to 1979

Front Sprocket

Part Number: JTF422

Teeth: 12

Available Sizes: 12, 13, 14, 15

Rear Sprocket

Part Number: JTR845

Teeth: 51 Check Availability

Available Sizes: 40, 41, 43, 45, 46, 47, 48, 49

Drive Chain

Pitch: 520

Length: 104

Please note that the chain shown in this listing is for size reference only. For the correct chain type and grade, please refer to the vehicle's manufacturer manual.

Gear Ratio Chart

Full Gear Ratio Chart (pdf)

Teeth12131415
403.333.082.862.67
413.423.152.932.73
433.583.313.072.87
453.753.463.213.00
463.833.543.293.07
473.923.623.363.13
484.003.693.433.20
494.083.773.503.27