the 450 gets a new throttle body, new fuel injector, and new ECU mapping so the engine makes more low end and midrange torque, and also offers even better throttle response. The power is easier to control, but without any loss of top end—better than ever for intermediate and expert riders alike. And our chassis designers were just as busy, updating the CRF450R subframe and taking the opportunity to fine-tune the subframe's stiffness. A new rear shock link and lower shock mount for improved front/rear balance and better suspension action especially over square-edged bumps.And finally, new 2011 AMA rules state that every MX bike will have to meet the new 94 decibel rule. Both our CRF450R and CRF250R do that easily, thanks to a new exhaust system that works in conjunction with the new FI settings. So while the other guys might just change a muffler, that's just where we started. And the first time the gate drops, it's gonna show.

GENERAL INFORMATION
MANUFACTURER	Honda
MODEL YEAR	2011
MODEL	CRF®450R
DIMENSIONS
GROUND CLEARANCE	13.1 in.
WHEELBASE	58.7 in.
SEAT HEIGHT	37.6 in.
ENGINE
ENGINE	1-cylinder, 4-stroke, Unicam®, 4-valve, titanium 36 mm intake
DISPLACEMENT	449 cc
BORE X STROKE	96 x 62.1 mm
COMPRESSION RATIO	12:1
CARBURETION	Programmed Fuel Injection (PGM-FI), 46 mm throttle body
FUEL CAPACITY	1.5 gal.
IGNITION	Full transistor with electronic advance
COOLING	Liquid
EXHAUST	30 mm steel
DRIVETRAIN
TRANSMISSION	Close-ratio 5-speed
FINAL DRIVE	#520 chain; 13T/49T
BRAKES/WHEELS/TIRES
BRAKES	Front: Single 240 mm disc with twin-piston caliper Rear: Single 240 mm disc
TIRES	Front: 80/100-21 Rear: 120/80-19
OPERATIONAL
SUSPENSION	Front: 48 mm inverted KYB Air-Oil-Separate (AOS) with rebound & compression damping adjustability; 12.2 in. travel Rear: Pro-Link KYB single shock with spring preload, rebound damping adjustability, compression damping adjustment separated into low-speed & high-speed; 12.5 in. travel
RAKE	27.2°
TRAIL	4.5 in. (114.2 mm)