2010 Kawasaki KX450F
General Specifications
| Model | Kawasaki KX450F |
| Year | 2010 |
| Category | Motocross |
| Engine Type | 449 cc single-cylinder, four-stroke, DOHC, 4-valve, liquid-cooled |
| Weight | Approximately 112 kg curb mass |
Engine
| Displacement | 449 cc |
| Bore x Stroke | 96.0 x 62.1 mm |
| Compression Ratio | 12.5:1 |
| Fuel System | Keihin electronic fuel injection with 43 mm throttle body |
| Ignition | Digital DC-CDI |
| Spark Plug | NGK CR8EIA-10 |
| Spark Plug Gap | 0.8-0.9 mm |
| Cooling System | Liquid-cooled |
| Starting System | Primary kick starter with automatic decompression |
Transmission
| Transmission | 5-speed constant-mesh, return shift |
| Clutch | Wet multi-disc, manual |
| Final Drive | Chain, 520 size |
Dimensions
| Overall Length | Approximately 2,195 mm |
| Overall Width | Approximately 820 mm |
| Overall Height | Approximately 1,275 mm |
| Wheelbase | Approximately 1,480 mm |
| Ground Clearance | Approximately 340 mm |
| Seat Height | Approximately 955 mm |
| Fuel Capacity | Approximately 7.0 L |
Chassis
Suspension
| Front Suspension | 48 mm Kayaba inverted twin-chamber cartridge fork, adjustable compression and rebound damping | Fork Oil Levels |
| Front Suspension Travel | 315 mm |
| Rear Suspension | Uni-Trak linkage with Kayaba gas-charged shock, adjustable spring preload, high/low-speed compression and rebound damping |
| Rear Suspension Travel | 315 mm |
| Fork Oil | Kayaba 01M or equivalent high-performance suspension fluid; twin-chamber cartridge fork |
Brakes & Wheels
| Front Brake | Single 250 mm semi-floating petal disc, twin-piston caliper |
| Rear Brake | Single 240 mm petal disc, single-piston caliper |
| Front Wheel Size | 21 x 1.60 in |
| Rear Wheel Size | 19 x 2.15 in |
Service Data
| Fuel Type | Premium unleaded petrol |
| Premix Information | Not applicable - four-stroke engine with separate engine lubrication |
| Gearbox Oil | Engine and transmission share the same oil; SAE 10W-40 motorcycle oil meeting API SG/SH/SJ/SL and JASO MA specification |
| Air Filter | Washable oiled polyurethane foam element |
| Service Notes | Competition four-stroke motocross engine. Inspect engine oil, oil filter, valve clearance, air filter, coolant, drive chain, brakes and suspension at competition-service intervals. |
2010 Kawasaki KX450F – Refining Kawasaki’s Fuel-Injected 450
The 2010 Kawasaki KX450F was primarily a refinement of the major redesign introduced for 2009 rather than another completely new generation. Kawasaki retained the aluminium perimeter frame, 449 cc DOHC engine and electronic fuel injection, while concentrating on improving power delivery, chassis feel and suspension setup.
The 449 cc engine continued with its 96.0 x 62.1 mm bore and stroke and high-compression four-valve cylinder head. Keihin electronic fuel injection replaced the carburettor tuning work familiar to earlier KX450F owners and provided more consistent fuel delivery as temperature and altitude changed. Kawasaki revised engine mapping and internal details for 2010 to improve throttle response and make the considerable 450-class power easier to use.
The aluminium perimeter frame carried forward with detail changes aimed at balancing rigidity and rider feedback. Kayaba suspension remained at both ends, with a 48 mm twin-chamber fork and Uni-Trak rear shock offering extensive damping adjustment. Correct oil and internal servicing have a major effect on fork performance, making the MXOwners fork oil reference useful during front-suspension maintenance.
Standard motocross wheel sizes remained 21 inches at the front and 19 inches at the rear, and owners can check replacement sizing with the MXOwners tyre size guide. For maintenance and rebuild work, the MXOwners Parts Finder can also help identify suitable replacement components. The 2010 KX450F represents Kawasaki refining its early fuel-injected 450 platform rather than reinventing it.
