2010 Honda CR450R
General Specifications
| Model | Honda CRF450R |
| Year | 2010 |
| Category | Motocross |
| Engine Type | Liquid-cooled 4-stroke single-cylinder, Unicam OHC, 4 valves |
| Weight | 106.5 kg curb weight, including required fluids and full fuel tank |
Engine
| Displacement | 449.7 cc |
| Bore x Stroke | 96.0 x 62.1 mm |
| Compression Ratio | 12.0:1 |
| Fuel System | Programmed Fuel Injection (PGM-FI), 50 mm throttle body |
| Ignition | ECM-controlled full-transistor electronic ignition |
| Spark Plug | NGK SILMAR9A-9S; for extended high-speed riding NGK SILMAR10A-9S |
| Spark Plug Gap | 0.8-0.9 mm |
| Cooling System | Liquid cooled |
| Starting System | Primary kick starter |
Transmission
| Transmission | 5-speed constant-mesh, 1-N-2-3-4-5 |
| Clutch | Wet multi-plate, coil spring |
| Final Drive | #520 chain, 13T/48T sprockets |
Dimensions
| Overall Length | 2,191 mm |
| Overall Width | 827 mm |
| Overall Height | 1,273 mm |
| Wheelbase | 1,491 mm |
| Ground Clearance | 332 mm |
| Seat Height | 954 mm |
| Fuel Capacity | 5.7 L |
Chassis
Suspension
| Front Suspension | 48 mm KYB inverted Air-Oil-Separate twin-chamber fork with adjustable compression and rebound damping | Fork Oil Levels |
| Front Suspension Travel | 310 mm fork stroke; 273 mm front wheel travel |
| Rear Suspension | Honda Pro-Link with KYB single shock, adjustable spring preload, low-speed and high-speed compression damping and rebound damping |
| Rear Suspension Travel | 320 mm |
| Fork Oil | KYB KHL15-11 fork oil; standard outer chamber capacity 355 cc per leg, adjustable range approximately 305-362 cc |
Brakes & Wheels
| Front Brake | 240 mm hydraulic single disc with twin-piston caliper |
| Rear Brake | 240 mm hydraulic single disc |
| Front Wheel Size | 21 in |
| Rear Wheel Size | 19 in |
Service Data
| Fuel Type | Unleaded petrol, minimum 91 pump octane (R+M/2) |
| Premix Information | Not applicable - 4-stroke engine with separate lubrication |
| Gearbox Oil | SAE 10W-30 4-stroke motorcycle oil meeting JASO MA; 0.59 L after draining, 0.67 L after disassembly |
| Air Filter | Washable oiled polyurethane foam air cleaner |
| Service Notes | Competition motorcycle with separate engine and transmission oil systems. Cold valve clearance: intake 0.16 ± 0.03 mm; exhaust 0.28 ± 0.03 mm. Standard idle speed 1,800 ± 100 rpm. Fork oil should be replaced frequently under competition use. |
2010 Honda CRF450R: Refining Honda's New EFI Platform
The 2010 Honda CRF450R was a refinement year rather than another major redesign. Honda had introduced an almost completely new CRF450R for 2009, bringing fuel injection, a new aluminium chassis and KYB suspension. For 2010 the company concentrated on improving the behaviour of that new platform rather than replacing it.
One of the main changes was revised ECU programming for the PGM-FI system. Honda altered the mapping to improve throttle response, particularly when moving on and off the throttle, while changes to the automatic decompression mechanism were aimed at making the kick-start-only CRF easier to fire up. The basic 449.7 cc Unicam engine, 50 mm throttle body and five-speed gearbox remained familiar.
Suspension received substantial attention. Honda revised the KYB fork oil settings, valving and fork seals, while the rear KYB shock gained a redesigned piston, revised high-speed compression adjuster and new valving. Owners servicing the front end can consult the MXOwners fork oil reference, while the MXOwners rear suspension reference is useful when working through rear-shock setup.
The aluminium twin-tube frame and Honda Progressive Steering Damper continued unchanged in principle, preserving the light, quick-turning character introduced with the 2009 generation. The 2010 CRF450R therefore represents Honda's first full season of refinement after the major EFI transition. For owners restoring or maintaining one today, the MXOwners parts finder can help identify replacement components while regular valve checks, separate engine and transmission oil changes, air-filter servicing and suspension maintenance remain essential.
