Honda CRF450R 2011 Service Manual

MAINTENANCE
SPARK PLUG
REMOVAL
Clean around the
spark plug base
with compressed
81f before
Remove the fuel tank (page 3-8),
Disconnect the spark plug cap from the cylinder
head.
Remove the spark plug and inspect it for damage.
Inspect or replace as described in the maintenance
schedule.
removmg, and be - '05, ' 06 : (page 4-4)
sure that no debfls - After '06: (page 4-5)
IS allowed 10 enter
the combustion
chamber,
INSPECTION
Check the following and re place if necessary
• Insulator for damage
• Electrodes for wear
• Burning condition , coloration;
This motorcycle's If the electrode is contaminated with accumulated
spark pJug IS objects or dirt, replace the spark plug .
equipped with an
iridium center
electrode Replace
the spar/( plug if the
electrode ;s
con/ammated.
Always usa rna
specrfied spark plug
on rhls motorcycle.
4·12
Replace the plug if the center electrode is rounde d
as s hown in the illustration .
RECOMMENDED SPARK PLUG lOR EQUIVALENT)
Standard NG K: IFR8Hll
DENSO: VK24PRZ11
Optional NGK: IFR9Hll
DENSO: VK27PRZll
,
CENTER ELECTRODE
INSULATOR
~~~ SIDE ELECTRODE
ROUNDED E LE C TR ODE
r
•

Honda CRF450R 2011 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	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
Trail	114mm (4.5 inches)
Induction	PGM-FI, 46mm throttle body
Front Suspension	48mm inverted with rebound and compression damping adjustability; 12.2 inches travel
Rear Suspension	Pro-Link single shock with rebound and compression damping adjustability; 12.4 inches of travel
Wheelbase	58.7 inches
Seat Height	37.6 inches
Fuel Capacity	1.5 gallons