Honda CRF450R 2012 Service Manual

Adjust the stopper plate angle as shown.
Apply oil to the decompressor cam mounting bolt
threads .
Install the decompressor cam mounting bolt.
Apply molybdenum oil solution to the rocker arm
bore and valve slipper surfaces.
Install the rocker arm and rocker arm shaft into the
camshaft holder .
Install a new stopper ring into the groove in the
camshaft holder.
Install the de comp ressor arm, decompressor lifter
and spring .
• Align the decompressor arm and decompressor
lifter as shown .
• Align the spring end and camshaft holder tab 85
sh own.
~ .--
CYLINDER HEADIVALVES
ASSEMBLY ...--- BOLT
,
STOPPER PLATE
9-15

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