Honda CRF450R 2007 Service Manual

MAINTENANCE
DRIVE CHAIN
Never inspect and
adjust the drive
chain while the
engine is running.
4-24
DRIVE CHAIN SLACK INSPECTION
Raise the rear wheel off the ground by placing a
workstand under the engine.
Measure the chain slack, on the
upper chain run,
midway between the sprockets.
CHAIN SLACK: 25 - 35 mm (1 .0 - 1.4 in)
I NOTICE I
Excessive chain slack, 60 mm (2.4 in) Of more, may
damage the frame.
ADJUSTMENT
If the chain needs adjustment, loosen the axle nut I"'..,,...r:;:;;:~';.';::;;:;"
and adjuster lock nuts, and turn the adjusters.
Check that the index marks are in the same
position
on each side, then tight en the axle nut to the speci-
fied torque.
TORQUE: 1 28 N'm ( 13 .1 kgf·m, 94lbf.ft)
After torquing the axle nut, seat the adjusters
snugly against the adjusting blocks
and tighten the
adjuster lock nuts to the specified torque.
TOROUE : 27 N'm (2.8 kgf·m, 20 Ibl·ft)
CLEANING AND LUBRICATION
Clean the dri ve chain in non-flammable or high , ---- ------------- ,
flash-point solvent and wipe it dry. SOFT BRUSH
SOLVE NT
Be s ur e the chain has dried completely before lubri-
cating.
Inspect the chain for possible wear or damage;
replace any chain that
has damaged railers or loose C LE ANING
fitting links.
Replace any chain that has damaged rollers, loose
fining
links, or ot herwise appears unserviceable. WIPE AND DRY D Q DC
Installing a new ch ai n on badly wo rn sprockets will
cause the new chain to wear quickly.
Inspect and replace sprocket as necessary. LUBRICATE : ~ ~
Measure the drive chain inner plate widt h.
SERVICE LIMIT: 13 .4 mm (0 . 53 in)
If the measurement exceeds the service limit,
replace the chain.
S ER VIC E LIMIT: 13.4 mm (O.53 in)
o o o o
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Honda CRF450R 2007 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Transmission	5-speed
Final Drive	#520 chain; 13T/48T
Front Suspension	47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	110/90-19
Wheelbase	58.3 inches
Seat Height	37.6 inches
Fuel Capacity	1.9 gallons
Induction	Keihin 40mm carburetor
Ignition	CDI
Rear Suspension	Pro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and compression damping adjustment
Trail	4.6 inches