2012 YAMAHA YZ250F check engine

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Page 103 of 198

YAMAHA YZ250F 2012  Owners Manual 4-29
CYLINDER AND PISTON
2. Position:
• Piston ring
(in cylinder)
Insert a ring into the cylinder and 
push it approximately 10 mm (0.39 in) 
into the cylinder. Push the ring with 
the piston crown

Page 107 of 198

YAMAHA YZ250F 2012  Owners Manual 4-33
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

Page 115 of 198

YAMAHA YZ250F 2012  Owners Manual 4-41
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 te

Page 118 of 198

YAMAHA YZ250F 2012  Owners Manual 4-44
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

Page 134 of 198

YAMAHA YZ250F 2012  Owners Manual 4-60
CRANKCASE AND CRANKSHAFT
DISASSEMBLING THE 
CRANKCASE
1. Separate:
• Right crankcase
• Left crankcase
Separation steps:
a. Remove the crankcase bolts "1", 
hose guide "2" and clutch cable 
ho

Page 136 of 198

YAMAHA YZ250F 2012  Owners Manual 4-62
CRANKCASE AND CRANKSHAFT
the sealant.
5. Install:
• Dowel pin "1"
• O-ring "2" 
• Right crankcase
To left crankcase.
• Apply the lithium soap base grease 
on the O-ring.
• Fit the right

Page 139 of 198

YAMAHA YZ250F 2012  Owners Manual 4-65
TRANSMISSION, SHIFT CAM AND SHIFT FORK
3. Install:
• Washer "1"
• Circlip "2" 
• Be sure the circlip sharp-edged cor-
ner "a" is positioned opposite side 
to the washer and gear "b".
• In

Page 165 of 198

YAMAHA YZ250F 2012  Owners Manual 5-26
HANDLEBAR
3. Tighten:
• Nut (handlebar lower holder) "1"
4. Install:
• Left grip "1"
Apply the adhesive to the handle-
bar "2".
• Before applying the adhesive, wipe 
off grease or oil on th
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