Yamaha YP125R Service Manual

TRANSMISSION (YP250R)
5-114
EAS26250
REMOVING THE TRANSMISSION
1. Remove:
• Transmission case cover
T
IP
Loosen each bolt 1/4 of a turn at a time, in stag-
es and in a crisscross pattern. After all of the
bolts are fully loosened, remove them.
EAS26300
CHECKING THE TRANSMISSION
1. Check:
• Transmission gears
Blue discoloration/pitting/wear → Replace
the defective gear(s).
• Transmission gear dogs
Cracks/damage/rounded edges → Replace
the defective gear(s).
2. Check:
• Transmission gear engagement
(each pinion gear to its respective wheel
gear)
Incorrect → Reassemble the transmission
axle assemblies.
3. Check:
• Transmission gear movement
Rough movement → Replace the defective
part(s).
EAS37P1066
INSTALLING THE TRANSMISSION
1. Install:
• Oil seal “1”
• Oil seal “2”
Oil seal installed depth
0–0.5 mm (0–0.020 in)
a. Oil seal installed depth
a
a
1
2

Yamaha YP125R Specifications

General

Engine Type	Liquid-cooled, 4-stroke, SOHC, 4-valve
Bore x Stroke	52.4 mm x 57.9 mm
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	V-Belt Automatic
Front Suspension	Telescopic fork
Rear Suspension	Unit Swing
Front Brake	Hydraulic single disc, Ø267 mm
Starter System	Electric
Rear Tyre	140/70-14M/C 62P (Tubeless)