Honda CRF450R 2012 Service Manual

l
l
Be careful nor fO
drop the bolts into
the crankcase.
Be careful not to
drop the
decompressor shaft
Md decompressOf
p lung e r,
Insert the stopper tool into the cam chain tensioner
lifter .
Turn the stopper 1001 clockwise fully and lock the
cam chain tensioner lifter by pushing the handle.
TOOL:
Tensioner s topp er 070MG·0010100 or
07AMG-001A100
(U .S. A. onl y)
A tool can easily be made from a thin (1 mm thick )
piece of steel as shown.
Loosen the one cam sprocket bolt.
Turn the crankshaft clockwise one turn , and remove
the other cam sprocket bolt.
Turn the crankshaft clockwise one turn again , and
remove the remaining cam sprocket bolt.
Remove the cam sprocket
from the camshaft and
cam chain.
Suspend the cam chain with a piece of wire to
prevent
it from falling into the crankcase.
Make sure the piston is at
TOC (Top Dead Center) on
the compression stroke.
l oosen the camshaft holder
mounting bolts in a
crisscross panern
in two or three steps.
Remove the camshaft holder assembly.
• Va l ve lifters are installed into the camshaft
hol
der assembly.
•
The shims may stick to the inside of the valve
lifters. Do not
allow the shims to drop into the
crankcase.
• Be careful not to drop the decompressor shaft
and decompressor plunger.
CYLINDER HEADIVALVES
19mm
12mm
+
J
0
3. 5m
.~
I
f
8.Smm
m
9-17

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