Market Segment:
High-performance Motocross Competition
Competitors:
Yamaha YZ450F, Honda CRF450R, Suzuki RM-Z450, KTM 450 SX-F
Engine Type:
Liquid-cooled, four-stroke, DOHC, single cylinder
Fuel Delivery:
Digital Fuel Injection (DFI) with dual injectors
Suspension Front:
48mm inverted telescopic cartridge fork with adjustable compression and rebound damping
Suspension Rear:
New Uni-Trak linkage system with gas-oil separate type shock absorber, adjustable for pre-load, compression, and rebound damping
Value For Mechanics:
Provides dealer-level expertise for comprehensive servicing and repair
Engine Internal:
Top End Rebuild, Crankshaft, Transmission
Fuel System:
DFI (Digital Fuel Injection) System Diagnostics and Servicing
Lubrication System:
Engine Lubrication System, Oil Pump, Oil Passages
Cooling System:
Radiator, Coolant Circulation, Thermostat
Drivetrain:
Clutch, Final Drive (Chain and Sprockets)
Chassis Components:
Wheels, Tires, Brakes (Front and Rear), Suspension (Front and Rear), Steering, Frame
Electrical System:
Ignition, Lighting, Battery, Wiring Diagrams
Disassembly Assembly:
Complete Strip Down and Reassembly Procedures
Diagnostics:
Comprehensive Troubleshooting and Diagnostic Procedures
Maintenance:
Periodic Maintenance Schedules and Procedures
Rebuilding:
Engine Top End and Crankshaft/Transmission Rebuilds
Adjustments:
Clutch Adjustment, Suspension Adjustment, Steering Head Adjustment
Depth:
Factory Level Detail for All Repair and Maintenance Tasks
Torque Specifications:
Included for all critical fasteners
Special Tools:
Identification of required special tools
Bore X Stroke:
96.0 x 62.1 mm
Compression Ratio:
12.0:1 (typical)
Valve Train:
DOHC, 4 valves per cylinder
Horsepower:
Approx. 55-58 HP (at crank, varies by tune and testing)
Torque:
Approx. 45-47 Nm (at crank, varies by tune and testing)
Fuel Delivery Type:
Digital Fuel Injection (DFI)
Throttle Body Size:
43 mm (typical)
Injectors:
Dual Injectors (Primary and Secondary)
Fuel Type:
Unleaded gasoline, premium (91+ octane recommended)
Type:
5-speed, constant mesh
Clutch:
Wet, multi-disc, manual
Gear Ratios:
Detailed in manual (e.g., 1st: 2.615, 2nd: 1.941, 3rd: 1.550, 4th: 1.294, 5th: 1.130)
Final Drive Ratio:
3.900 (typically 13T front, 51T rear sprocket)
Infotainment System:
N/A (Competition Motocross Bike)
Driver Assistance Features:
N/A (Competition Motocross Bike)
Connectivity Options:
N/A (Competition Motocross Bike)
Engine Management System:
Digital Fuel Injection (DFI) with ECU control for ignition timing and fuel delivery
Oil Change Interval:
Refer to manual (typically after every few races or 10-20 hours of use for competition)
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions
Valve Clearance Check:
Refer to manual (typically at 10-20 hours or major rebuilds)
Engine Oil Type:
Refer to manual; typically SAE 10W-40, JASO MA specification motorcycle oil (e.g., Kawasaki Genuine Oil)
Engine Oil Capacity:
Approx. 0.7-0.8 Liters (without filter change), 0.8-0.9 Liters (with filter change)
Coolant Type:
Permanent type antifreeze coolant (50/50 mix with distilled water)
Fork Oil Type:
Refer to manual for specific grade (e.g., Showa SS-05 or equivalent)
Clutch Wear:
Can experience accelerated wear under hard use; manual details inspection and replacement.
DFI Tuning:
May benefit from ECU remapping or ignition timing adjustments for optimal performance; manual covers base DFI parameters.
Suspension Seals:
Fork and shock seals can wear over time; manual provides seal replacement procedures.
Manufacturer History:
Kawasaki Heavy Industries, Ltd. is a Japanese multinational corporation founded in 1896, known for motorcycles, heavy equipment, aerospace, and defense.
Kx Series Heritage:
The KX line has a long-standing racing pedigree, with significant design advancements over its generations, particularly in chassis and engine technology.
Kx450 Generation 2009-2011:
This generation represented an evolution of the KX450F, building on previous successes with refined DFI and chassis updates for improved handling and power delivery.
Manufacturing Location:
Japan (typical for Kawasaki motorcycles)
