2010 YAMAHA WR 250F engine

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Page 132 of 232

YAMAHA WR 250F 2010  Owners Manual 5-29
CLUTCH
CLUTCH
REMOVING THE CLUTCHOrder Part name Qty Remarks Drain the engine oil.  Refer to "CHANGING THE ENGINE OIL" 
section in the CHAPTER 3.
Brake pedal  Refer to "ENGINE REMOVAL" section.

Page 134 of 232

YAMAHA WR 250F 2010  Owners Manual 5-31
CLUTCH
REMOVING THE CLUTCH BOSS
1. Remove:•Nut "1"
• Lock washer "2"
• Clutch boss "3"
Straighten the lock washer tab and 
use the clutch holding tool "4" to hold 
the clutch boss.
A. For U

Page 135 of 232

YAMAHA WR 250F 2010  Owners Manual 5-32
CLUTCH
INSTALLING THE CLUTCH
1. Install:• Primary driven gear "1"
• Thrust washer "2"
• Clutch boss "3"
Apply the engine oil on the primary 
driven gear inner circumference.
2. Install:
•

Page 137 of 232

YAMAHA WR 250F 2010  Owners Manual 5-34
OIL FILTER ELEMENT AND WATER PUMP
OIL FILTER ELEMENT AND WATER PUMP
REMOVING THE OIL FILTER ELEMENT AND WATER PUMPOrder Part name Qty Remarks Drain the engine oil.  Refer to "CHANGING THE ENGINE

Page 140 of 232

YAMAHA WR 250F 2010  Owners Manual 5-37
OIL FILTER ELEMENT AND WATER PUMP
INSTALLING THE RIGHT 
CRANKCASE COVER
1. Install:• Dowel pin "1"
• O-ring "2" 
•Collar "3"
• Gasket "4" 
Apply the lithium soap base grease 
on the O-rin

Page 143 of 232

YAMAHA WR 250F 2010  Owners Manual 5-40
BALANCER
REMOVING THE BALANCER
1. Straighten the lock washer tab.
2. Loosen:• Nut (primary drive gear) "1"
• Nut (balancer shaft driven gear) "2"
Place an aluminum plate "a" between 
the teet

Page 145 of 232

YAMAHA WR 250F 2010  Owners Manual 5-42
OIL PUMP
REMOVING THE OIL TANKOrder Part name Qty Remarks Drain the engine oil. Refer to "CHANGING THE ENGINE OIL" 
section in the CHAPTER 3.
1 Oil hose 2 1
2 Oil hose 1 1
3 Dowel pin 2
4 Oil ta

Page 146 of 232

YAMAHA WR 250F 2010  Owners Manual 5-43
OIL PUMP
CHECKING THE OIL PUMP
1. Inspect:• Oil pump drive gear "1"
• Oil pump drive shaft "2"
• Rotor housing "3"
• Oil pump cover "4"Cracks/wear/damage →Replace.
2. Measure: • Tip c