Yamaha YZ125 2009 User Manual

5-27
FRONT FORK
CHECKING THE COLLAR
1. Inspect:
• Piston metal "1"
Wear/damage → Replace.
CHECKING THE FORK SPRING
1. Measure:
• Fork spring free length "a"
Out of specification → Replace.
CHECKING THE INNER TUBE
1. Inspect:
• Inner tube surface "a"
Score marks → Repair or replace.
Use #1,000 grit wet sandpaper.
Damaged oil lock piece → Replace.
• Inner tube bends
Out of specification → Replace.
Use the dial gauge "1".
The bending value is shown by one half of the
dial gauge reading.
Do not attempt to straighten a bent inner
tube as this may dangerously weaken the
tube.
CHECKING THE OUTER TUBE
1. Inspect:
• Outer tube "1"
Score marks/wear/damage → Replace.
CHECKING THE ADJUSTER
1. Inspect:
• Adjuster "1"
•O-ring "2"
Wear/damage → Replace.
Fork spring free length:
454 mm (17.9 in)
<Limit>: 449 mm (17.7 in)
Inner tube bending limit:
0.2 mm (0.008 in)

Yamaha YZ125 2009 Specifications

General

Engine Type	124cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke	54.0mm x 54.5mm
Compression Ratio	8.6~10.7:1
Ignition	CDI
Final Drive	Chain
Front Brake	Hydraulic single disc brake, 250mm
Rear Brake	Hydraulic single disc brake, 245mm
Front Tire	80/100-21
Rear Tire	100/90-19
Overall Width	32.5 in
Wheelbase	58.3 in
Fuel Capacity	2.1 gal
Wet Weight	207 lb
Dry Weight	194 lb
Fuel Delivery	Mikuni® TMX 38
Front Suspension	Speed-sensitive inverted fork; fully adjustable, 11.8 in travel
Rear Suspension	Fully adjustable, 12.4-in travel