2009 YAMAHA YZ450F width

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Page 23 of 190

YAMAHA YZ450F 2009  Owners Manual 2-1
GENERAL SPECIFICATIONS
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model name: YZ450FY (USA, CDN, AUS, NZ)
YZ450F (EUROPE, ZA)
Model code number: 34P1 (USA,CDN)
34P2 (EUROPE)
34P4 (AUS, NZ, ZA)
Dimensio

Page 26 of 190

YAMAHA YZ450F 2009  Owners Manual 2-4
MAINTENANCE SPECIFICATIONS
Timing chain:
Timing chain type/No. of links 98XRH2010-118M/118 ----
Timing chain adjustment method Automatic ----
Valve, valve seat, valve guide:
Valve clearance (cold)

Page 27 of 190

YAMAHA YZ450F 2009  Owners Manual 2-5
MAINTENANCE SPECIFICATIONS
Stem-to-guide clearance (IN) 0.010–0.037 mm (0.0004–0.0015 in) 0.08 mm (0.003 
in)
Stem-to-guide clearance (EX) 0.020–0.047 mm (0.0008–0.0019 in) 0.10 mm (0.004

Page 28 of 190

YAMAHA YZ450F 2009  Owners Manual 2-6
MAINTENANCE SPECIFICATIONS
Piston off-set 1 mm (0.0394 in) ----
Piston pin bore inside diameter 18.004–18.015 mm (0.7088–0.7093 in) 18.045 mm 
(0.7104 in)
Piston pin outside diameter 17.991–

Page 30 of 190

YAMAHA YZ450F 2009  Owners Manual 2-8
MAINTENANCE SPECIFICATIONS
CHASSISLubrication system:
Oil filter type Paper type ----
Oil pump type Trochoid type ----
Tip clearance 0.12 mm or less (0.0047 in or less) 0.20 mm (0.008 
in)
Side cl

Page 87 of 190

YAMAHA YZ450F 2009  Owners Manual 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.

Page 93 of 190

YAMAHA YZ450F 2009  Owners Manual 4-23
VALVES AND VALVE SPRINGS
REMOVING THE VALVE LIFTER 
AND VALVE COTTER
1. Remove:
• Valve lifter "1"
• Pad "2"
Identify each lifter "1" and pad "2" po-
sition very carefully so that they can 
b

Page 94 of 190

YAMAHA YZ450F 2009  Owners Manual 4-24
VALVES AND VALVE SPRINGS
4. Measure:
• Margin thickness "a"
Out of specification→Replace.
5. Measure:
• Runout (valve stem)
Out of specification→Replace.
• When installing a new valve a
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