Yamaha YZ125 2009 User Manual

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KICK SHAFT AND SHIFT SHAFT
CHECKING THE SHIFT SHAFT
1. Inspect:
• Shift shaft "1"
Bend/damage → Replace.
• Spring "2"
Broken → Replace.
CHECKING THE SHIFT GUIDE AND SHIFT
LEVER ASSEMBLY
1. Inspect:
• Shift guide "1"
• Shift lever "2"
•Pawl "3"
• Pawl pin "4"
• Spring "5"
Wear/damage → Replace.
CHECKING THE STOPPER LEVER
1. Inspect:
• Stopper lever "1"
Wear/damage → Replace.
• Roller "2"
Rotate outer race with a finger.
Rough spot/Seizure → Replace the stopper
lever.
• Torsion spring "3"
Broken → Replace.
CHECKING THE PRIMARY DRIVE GEAR
AND PRIMARY DRIVEN GEAR
1. Inspect:
• Primary drive gear "1"
• Primary driven gear "2"
Wear/Damage → Replace.
INSTALLING THE STOPPER LEVER
1. Install:
• Torsion spring "1"
• Stopper lever "2"
• Bolt (stopper lever) "3"
• Align the stopper lever roller with the slot on
segment.
• When installing the stopper lever, make sure
that the torsion spring is in the position as
shown.
Bolt (stopper lever):
10 Nm (1.0 m•kg, 7.2 ft•lb)

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