2009 Honda CR450R

2009 Honda CRF450R: The Fuel-Injected Generation Arrives

The 2009 Honda CRF450R was one of the biggest changes in the model's history. This was not a routine annual update: Honda replaced the previous carburetted platform with a substantially redesigned motorcycle featuring a new engine, a new fifth-generation aluminium frame, electronic fuel injection and KYB suspension. Very few major components were carried over unchanged from the 2008 machine, making 2009 the beginning of a distinct CRF450R generation.

The headline change was Honda's Programmed Fuel Injection system. The familiar Keihin FCR carburettor disappeared, replaced by a 50 mm throttle body, injector, fuel pump, ECU and associated sensors. Unlike road motorcycles that could rely on a battery, Honda developed a batteryless system suitable for motocross. Once the engine was turning during starting, the electrical system supplied the ECU and fuel pump. The result was much more consistent fuelling across temperature and altitude changes, as well as the ability to tune fuel delivery and ignition electronically.

Honda redesigned the 449.4 cc Unicam engine around the new chassis rather than simply adding injection to the old motor. The connecting rod was shortened, the cylinder height reduced and the cylinder head made more compact. The exhaust-valve arrangement changed to individual rocker arms, and the engine itself became narrower and lighter. These changes allowed Honda to position the engine lower and farther forward in the frame, concentrating mass closer to the centre of the motorcycle.

The chassis was equally new. Honda's fifth-generation aluminium twin-spar frame used revised geometry and a longer swingarm, while the fuel tank shrank from roughly 7.2 litres to 5.7 litres thanks in part to the improved efficiency of fuel injection. The flatter seat and slimmer bodywork made it easier for riders to move forward in corners, while improved access to the air filter addressed a long-standing complaint with earlier CRF450Rs. Owners identifying components during restoration can use the MXOwners parts finder when comparing replacement parts.

Another major break with previous CRF450R practice was the suspension. Honda moved away from the Showa fork and shock used on earlier models and fitted KYB units front and rear. The 48 mm KYB Air-Oil-Separate fork offered adjustable compression and rebound damping, while the Pro-Link rear shock retained extensive low-speed, high-speed and rebound adjustment. Correct oil quantity has a major effect on twin-chamber fork behaviour, so the MXOwners fork oil reference is useful when servicing older suspension.

The 2009 bike also retained Honda's Progressive Steering Damper concept while revising the overall steering geometry. The combination of the more compact engine, lower centre of gravity, longer swingarm and new chassis produced a motorcycle that felt noticeably lighter and turned more quickly than its predecessor, even though it remained a full-size 450 four-stroke.

For today's owner, the 2009 CRF450R is important because it marks the dividing line between Honda's carburetted era and its modern fuel-injected motocross machines. It also introduced systems that require a slightly different maintenance mindset. Fuel filters, injector condition, electrical connectors and fuel-pump health become part of ownership alongside traditional CRF jobs such as valve-clearance checks, separate engine and gearbox oil changes and regular air-filter servicing.

The 2009 CRF450R was therefore far more than an updated 2008 bike. It established a new engine and chassis architecture, introduced EFI to Honda's premier motocross machine and changed the suspension supplier at the same time. For riders and collectors, it remains one of the most historically significant CRF450R model years and an important milestone in the transition from mechanically simple carburetted 450s to the electronically managed motocross bikes that followed.