YAMAHA YZ125 2000

OEM SPECS 

FRONT TYRE SIZE: 80/100-21 (1.60x21 RIM)
REAR TYRE SIZE: 100/90-19 (1.85x19 RIM)
CHAIN: 520x112
FRONT SPROCKET: 13T
REAR SPROCKET: 48T
MAIN JET: 350
PILOT JET: 35
SPARK PLUG: BR9EG