JT Sprockets

Online Catalogue

Yamaha YZ80 S,T,U,W,A,B,D — USA

1986 to 1992

Front Sprocket

Steel Front Sprocket

Part Number: JTF1263

Teeth: 14

Available Sizes: 11, 12, 13, 14, 15, 16, 17

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR831

Teeth: 46

Available Sizes: 46, 48

Aluminium Rear Race Sprocket

Part Number: JTA831

Teeth: 46

Available Sizes: 46, 47

Drive Chain

Pitch: 428

Length: 112

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

TeethFront Sprocket
11121314151617
Rear Sprocket464.18
+27.3%
3.83
+16.7%
3.54
+7.7%
3.29
standard
3.07
-6.7%
2.88
-12.5%
2.71
-17.6%
474.27
+30.0%
3.92
+19.2%
3.62
+10.0%
3.36
+2.2%
3.13
-4.6%
2.94
-10.6%
2.76
-15.9%
484.36
+32.8%
4.00
+21.7%
3.69
+12.4%
3.43
+4.3%
3.20
-2.6%
3.00
-8.7%
2.82
-14.1%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)