JT Sprockets

Online Catalogue

Kawasaki EX400 GJF,GJFA,GKF,GKFA,GKFB,GLFA Ninja ABS

2019 to 2020

Front Sprocket

Steel Front Sprocket

Part Number: JTF1539

Teeth: 14

Available Sizes: 14, 15

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF1539RB

Teeth: 14

Available Sizes: 14

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR486

Teeth: 41

Available Sizes: 38, 39, 41, 42, 43, 44, 45, 46, 47

Drive Chain

Pitch: 520

Length: 106

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
1415
Rear Sprocket382.71
-7.3%
2.53
-13.5%
392.79
-4.9%
2.60
-11.2%
412.93
standard
2.73
-6.7%
423.00
+2.4%
2.80
-4.4%
433.07
+4.9%
2.87
-2.1%
443.14
+7.3%
2.93
+0.2%
453.21
+9.8%
3.00
+2.4%
463.29
+12.2%
3.07
+4.7%
473.36
+14.6%
3.13
+7.0%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)