tire size YAMAHA YZ125LC 2003 Owners Manual

2-2
SPECGENERAL SPECIFICATIONS
Carburetor:
Type/Manufacturer TMXχ
38SS/MIKUNI
Spark plug:
Type/Manufacturer BR9EG/NGK (resistance type)
Gap 0.5~0.6 mm (0.020~0.024 in)
Clutch type: Wet, multiple-disc
Transmission:
Primary reduction system Gear
Primary reduction ratio 64/19 (3.368)
Secondary reduction system Chain drive
Secondary reduction ratio 49/13 (3.769)
Transmission type Constant mesh, 5-speed
Operation Left foot operation
Gear ratio: 1st 30/13 (2.308)
2nd 28/15 (1.867)
3rd 29/19 (1.526)
4th 24/19 (1.263)
5th 25/23 (1.087)
Chassis:USA, ZA, AUS, NZEUROPE,CDN
Frame type Semi double cradle←
Caster angle 25.6° 25.4°
Trail 108 mm (4.25 in) 104 mm (4.09 in)
Tire:
Type With tube
Size (front) 80/100-21 51M
Size (rear) 100/90-19 57M
Tire pressure (front and rear) 100 kPa (1.0 kgf/cm2, 15 psi)
Brake:
Front brake type Single disc brake
Operation Right hand operation
Rear brake type Single disc brake
Operation Right foot operation
Suspension:
Front suspension Telescopic fork
Rear suspension Swingarm (link type monocross suspension)
Shock absorber:
Front shock absorber Coil spring/oil damper
Rear shock absorber Coil spring/Gas, oil damper
Wheel travel:
Front wheel travel 300 mm (11.8 in)
Rear wheel travel 315 mm (12.4 in)
Electrical:
Ignition system CDI magneto
2

7-15
TUNSETTING
EC72N000
Drive and driven sprockets setting parts
EC721003
Tire pressure
Tire pressure should be adjust to suit the road
surface condition of the circuit.
9Under a rainy, muddy, sandy, or slippery condi-
tion, the tire pressure should be lower for a larg-
er area of contact with the road surface.
9Under a stony or hard road condition, the tire
pressure should be higher to prevent a flat tire.
Part name Size Part number
Drive sprocket
1 1
12T 9383A-12017
(STD) 13T 9383A-13031
14T 9383A-14054
Driven sprocket 2 2
47T
5ET-25447-00
48T5NY-25448-00
(STD) 49T5NY-25449-00
50T5NY-25450-00
51T5NY-25451-00
52T5NY-25452-00
Standard tire pressure:
100 kPa (1.0 kgf/cm
2, 15 psi)
Extent of adjustment:
60~80 kPa
(0.6~0.8 kgf/cm
2, 9.0~12 psi)
Extent of adjustment:
100~120 kPa
(1.0~1.2 kgf/cm
2, 15~18 psi)