Online Catalogue

Yamaha MX400 B — USA

1975

Front Sprocket

Lightweight Self-Cleaning Front Sprocket

Part Number: JTF565SC

Teeth: 14

Available Sizes: 12, 13, 14

JTF565SC is a Lightweight front sprocket with self-cleaning grooves

Steel Front Sprocket

Part Number: JTF565

Teeth: 14

Available Sizes: 12, 13, 14, 15, 16, 17, 18

OE Type Rubber Cushioned Front Sprocket

Part Number: JTF565RB

Teeth: 14

Available Sizes: 14, 15, 16

Rear Sprocket

Steel Rear Sprocket

Part Number: JTR853

Teeth: 50

Available Sizes: 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52

Racelite Aluminium Rear Race Sprocket

Part Number: JTA853BLK

Teeth: 50

Available Sizes: 40, 41, 43, 44, 46, 48, 49, 50, 51, 52

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

Teeth		Front Sprocket
Teeth		12	13	14	15	16	17	18
Rear Sprocket	50	4.17 +16.7%	3.85 +7.7%	3.57 standard	3.33 -6.7%	3.12 -12.5%	2.94 -17.6%	2.78 -22.2%

Lower gear ratios allow for higher top speeds.

Higher gear ratios increase torque for better acceleration.

Full Gear Ratio Chart (pdf)