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YAMAHA YZ450F 2009 User Guide YZ450F 2009 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/53994/w960_53994-0.png YAMAHA YZ450F 2009 User Guide

Page 57 of 190

YAMAHA YZ450F 2009 User Guide 3-11
ENGINE
ADJUSTING THE VALVE 
CLEARANCE
• This section is intended for those 
who have basic knowledge and skill 
concerning the servicing of Yama-
ha motorcycles (e.g., Yamaha deal-
ers, service

Page 60 of 190

YAMAHA YZ450F 2009 User Guide 3-14
CHASSIS
CHASSIS
BLEEDING THE HYDRAULIC 
BRAKE SYSTEM
Bleed the brake system if:
• The system has been disassem-
bled.
• A brake hose has been loosened 
or removed.
• The brake fluid is very

Page 63 of 190

YAMAHA YZ450F 2009 User Guide 3-17
CHASSIS
CHECKING THE SPROCKET
1. Inspect:
• Sprocket teeth "a"
Excessive wear→Replace.
Replace the drive sprocket, rear 
wheel sprocket and drive chain as a 
set.
CHECKING THE DRIVE CHAIN
1.

Page 64 of 190

YAMAHA YZ450F 2009 User Guide 3-18
CHASSIS
A. Right
B. Left
Turn the adjuster so that the drive 
chain is in line with the sprocket, as 
viewed from the rear.
d. Tighten the axle nut while pushing 
down the drive chain.
e. Tighten

Page 65 of 190

YAMAHA YZ450F 2009 User Guide 3-19
CHASSIS
Do not force the adjuster past the 
minimum or maximum extent of 
adjustment. The adjuster may be 
damaged.
Always adjust each front fork to 
the same setting. Uneven adjust-
ment can cau

Page 67 of 190

YAMAHA YZ450F 2009 User Guide 3-21
CHASSIS
A tight spoke will emit a clear, ringing 
tone; a loose spoke will sound flat.
2. Tighten:
• Spokes
(with a spoke nipple wrench "1")
Be sure to tighten the spokes before 
and after brea

Page 76 of 190

YAMAHA YZ450F 2009 User Guide 4-6
RADIATOR
HANDLING NOTE
Do not remove the radiator cap 
when the engine and radiator are 
hot. Scalding hot fluid and steam 
may be blown out under pressure, 
which could cause serious injury. 
Whe

Page 86 of 190

YAMAHA YZ450F 2009 User Guide 4-16
CAMSHAFTS
REMOVING THE CAMSHAFT
1. Remove:
• Timing mark accessing screw "1"
• Crankshaft end accessing screw 
"2"
2. Align:
• T.D.C. mark
With align mark.
Checking steps:
a. Turn the crank

Page 87 of 190

YAMAHA YZ450F 2009 User Guide 4-17
CAMSHAFTS
Measurement steps:
a. Install the camshaft onto the cylin-
der head.
b. Position a strip of Plastigauge
® 
"1" onto the camshaft.
c. Install the clip, dowel pins and 
camshaft caps.
â€

Page 88 of 190

YAMAHA YZ450F 2009 User Guide 4-18
CAMSHAFTS
Do not turn the crankshaft during 
the camshaft installation. Damage 
or improper valve timing will re-
sult.
d. Install the clips, camshaft caps "4" 
and bolts (camshaft cap) "5".
•
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