JT Sprockets

Online Catalogue

Yamaha YZ250 F-N,P,R,S (4-Stroke)

2001 to 2004

Front Sprocket

Lightweight Self-Cleaning Front Sprocket

Part Number: JTF1590SC

Teeth: 13

Available Sizes: 13, 14

Steel Front Sprocket

Part Number: JTF1590

Teeth: 13

Available Sizes: 12, 13, 14

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR251

Teeth: 48

Available Sizes: 46, 47, 48, 49, 50, 51

Aluminium Rear Race Sprocket

Part Number: JTA251

Teeth: 48

Available Sizes: 48, 49, 50, 51, 52

Drive Chain

Pitch: 520

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
121314
Rear Sprocket463.83
+3.8%
3.54
-4.2%
3.29
-11.0%
473.92
+6.1%
3.62
-2.1%
3.36
-9.1%
484.00
+8.3%
3.69
standard
3.43
-7.1%
494.08
+10.6%
3.77
+2.1%
3.50
-5.2%
504.17
+12.8%
3.85
+4.2%
3.57
-3.3%
514.25
+15.1%
3.92
+6.2%
3.64
-1.3%
524.33
+17.4%
4.00
+8.3%
3.71
+0.6%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)