Honda CRF450R 2012 Service Manual

9. CYLINDER HEAD/VALVES
COMPONENT LOCATION .. ············· ··· ······· ·9·2
CYLINDER HEAD INSPECTION ............... 9·28
SERVICE INFORMATION ··· ·· ·· ····················9·3
VALVE GUIDE REPLACEMENT··············· 9· 29
TROUBLESHOOTING ................................. 9·6
VALVE SEAT INSPECTIONI
-
REFACING································ ·· ··· ·· ·········· 9·30
CYLINDER COMPRESSION TEST·· ·· ······· ·· · 9·7
CYLINDER HEAD ASSEMBLy· ······ ·· ········ 9·33
CYLINDER HEAD COVER REMOVAL .. ······ 9·7
CYLINDER HEAD INSTALLATION ........... 9·36
CAMSHAFT REMOVAL 1'05 - '07) ............. 9·8
CAMSHAFT INSTALLATION
CAMSHAFT REMOVAL IAfter '07) . .. . .. .... 9·16
('OS - '07)-····················· ·· ········ ·· ·············· ·· · 9·37
CYLINDER HEAD REMOVAL ··············· ·· · ·9·24
CAMSHAFT INSTALLATION
IAfter '07) .... .. .... .. ...................................... 9·39
CAM CHAIN TENSIONER/CAM CHAIN
GUiDE····· ·· ·········· ·· ·····································9·25
CYLINDER HEAD COVER
INSTALLATION
.................. .. .................... 9-42
CYLINDER HEAD
DiSASSEMBLy·· ·· ·· ···· ·· 9·27
9-1

Honda CRF450R 2012 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.5:1
Induction	Programmed Fuel Injection (PGM-FI), 46mm throttle body
Ignition	CDI
Transmission	Close-ratio five-speed
Final Drive	#520 chain; 13T/48T
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-19
Seat Height	37.6 inches
Ground Clearance	13.2 inches
Front Suspension	12.2 inches travel
Rear Suspension	Pro-Link Showa single shock with spring preload, rebound and compression damping adjustability; 12.4 inches travel
Rake	27° 04'
Trail	4.6 inches
Wheelbase	58.3 inches
Curb Weight	249 pounds