The KX125, specifically covering model variants M1 through M7F, represents a significant entry in the motocross competition motorcycle segment for the years 2003 through 2007. Building on an extensive motorsports legacy, these models are engineered for peak performance on the track, offering a potent 2-stroke, liquid-cooled 124 cc engine with Digital Fuel Injection (DFI). Known for their strong power delivery and competitive chassis dynamics, the KX125 series has historically been a formidable competitor in its class. This generation features advanced suspension technology, including upside-down cartridge forks and a Uni-Trak monoshock system, both adjustable for optimal rider tuning. The robust perimeter aluminum frame provides a lightweight yet durable foundation for aggressive riding.
This comprehensive workshop manual serves as an indispensable resource for owners, mechanics, and technicians responsible for the maintenance and repair of the KX125 (2003-2007) and KX250 (2003-2004) models. It provides factory-level diagnostic, repair, and maintenance data, ensuring the optimal performance and longevity of these competition machines. The manual meticulously details all major systems, including engine mechanicals, fuel and ignition systems, cooling, drivetrain, chassis, suspension, and electrical components. Key coverage areas encompass detailed step-by-step repair procedures, disassembly and reassembly instructions, periodic maintenance schedules, troubleshooting guides, and essential technical specifications such as torque values, clearances, and fluid capacities. Its accuracy and completeness mirror professional technician resources, making it the definitive guide for servicing these motorcycles.
Model Variant:
KX125-M1, KX125-M2, KX125-M3, KX125M6F, KX125M7F
Covered Model Years:
2003, 2004, 2005, 2006, 2007
Chassis Codes:
M1 (2003), M2 (2004), M3 (2005), M6F (2006), M7F (2007)
Additional Models Covered:
KX250 (2003-2004)
Manual Product Name:
KAWASAKI KX125 Workshop Manual 2003-2007
Vehicle Segment:
Motocross Competition Motorcycle
Target Audience:
Amateur and professional motocross racers, mechanics, and enthusiasts.
Key Competitors:
Yamaha YZ125, Honda CR125R, Suzuki RM125
Manual Value Proposition:
Provides factory-level diagnostic, repair, and maintenance data for optimal performance and longevity of the KX125/KX250.
Manual Accuracy:
Original factory documentation ensures accuracy and completeness, mirroring professional technician resources.
Coverage Scope:
Comprehensive service, repair, and maintenance information for specified Kawasaki KX125 and KX250 models.
Estimated Page Count:
Hundreds of pages (as indicated by description)
Manual Classification:
Workshop Manual / Factory Service Repair Manual
Engine Mechanical:
Engine Top End, Crankshaft/Transmission, Engine Lubrication System
Fuel And Ignition:
Fuel System (DFI - Digital Fuel Injection), Carburetor (if applicable on earlier sub-models or variant)
Cooling System:
Cooling System (Liquid Cooling)
Drivetrain:
Clutch, Final Drive (Chain Drive)
Chassis And Suspension:
Wheels/Tires, Brakes (Front and Rear), Suspension (Front and Rear), Steering, Frame
Electrical:
Electrical System, Wiring Diagrams (implied by 'Original Service Manuals, Wiring Diagrams and Bulletins')
Diagnostic Procedures:
Comprehensive diagnostic information, troubleshooting guides
Maintenance Procedures:
Periodic Maintenance, scheduled service tasks
Repair Procedures:
Detailed step-by-step repair instructions for all covered systems.
Disassembly Reassembly:
Engine Removal/Installation, component disassembly and reassembly
Technical Data References:
Specifications, torque values, clearances, fluid capacities, wiring diagrams.
Depth Of Information:
Professional Technician Level (diagnostic, repair, maintenance)
Compatibility:
All Versions of Windows & Mac
Required Software:
Adobe PDF Reader
Print Readability:
High (suitable for printing detailed diagrams and text)
Binding Type Digital:
N/A (Digital Format)
Paper Type Digital:
N/A (Digital Format)
Engine Type:
2-Stroke, Liquid-Cooled
Engine Displacement:
124 cc (for KX125 model)
Bore X Stroke:
54.0 x 54.5 mm (typical for this generation KX125)
Compression Ratio:
9.9:1 (typical for this generation KX125)
Horsepower:
Approximately 38-40 HP (estimated for 2003-2007 KX125, varies by year and tuning)
Torque:
Approximately 17-18 lb-ft (estimated for 2003-2007 KX125)
Fuel Delivery:
Digital Fuel Injection (DFI)
Carburetor Type:
N/A (DFI equipped)
Fuel Type:
Unleaded gasoline, minimum 91 octane recommended
Lubrication System Type:
Premix (2-stroke oil mixed with gasoline)
Oil Type Recommendation:
JASO FD certified 2-stroke engine oil (manual will specify exact API/JASO rating)
Transmission Type:
6-speed constant mesh
Optional Transmission:
N/A
Clutch Type:
Wet multi-disc
Transmission Oil Type:
API GL-4 SAE 10W-30 or SAE 10W-40 gear oil (manual will specify exact type and capacity)
Overall Length:
Approximately 2155 mm (typical for this era KX125)
Overall Width:
Approximately 800 mm (typical for this era KX125)
Overall Height:
Approximately 1260 mm (typical for this era KX125)
Dry Weight:
Approximately 91 kg (typical for this era KX125)
Wet Weight:
Approximately 97 kg (typical, with all fluids)
Safety Ratings:
N/A (Competition Motorcycle, not subject to road safety regulations)
Braking System:
Hydraulic disc brakes, front and rear
Frame Construction:
Perimeter aluminum frame
Infotainment System:
N/A (Competition Motorcycle)
Driver Assistance Features:
N/A (Competition Motorcycle)
Connectivity Features:
N/A (Competition Motorcycle)
Engine Management System:
Digital Fuel Injection (DFI)
Front Suspension Type:
Upside-down cartridge fork (e.g., Kayaba or Showa), adjustable compression and rebound damping.
Rear Suspension Type:
Monoshock with linkage system (e.g., Kawasaki Uni-Trak), adjustable preload, compression, and rebound damping.
Oil Change Interval:
Refer to manual for specific transmission oil change intervals (typically every 10-15 hours of riding or annually).
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions (refer to manual for specific interval).
Spark Plug Replacement:
Refer to manual for recommended intervals based on usage (typically 25-50 hours).
Coolant Type:
Permanent type anti-freeze coolant (manual will specify mixture ratio and type).
Brake Fluid Type:
DOT 4 hydraulic brake fluid (manual will specify).
Common Wear Items:
Piston rings, clutch plates, wheel bearings, steering head bearings, chain and sprockets, brake pads.
Specific Model Concerns:
Refer to manual for any known specific issues or common fixes for these model years, such as carburetor jetting tuning, DFI sensor issues, or suspension service.
Kawasaki Motorsports Legacy:
Kawasaki has a long and successful history in off-road and motocross racing, with the KX line being a cornerstone of their performance offerings.
Kx125 Development:
The KX125 has been a dominant force in the 125cc class for decades, evolving through various engine technologies, suspension advancements, and chassis designs. The 2003-2007 models represent a specific generation focusing on performance and race-worthiness.
Production Period:
2003-2007 for these specific models.
Model Awards:
Kawasaki KX models have historically received numerous awards and accolades in motocross magazines and racing series for their performance and handling.
Performance Ratings:
Highly regarded for strong power delivery and competitive chassis dynamics within the 125cc class for their production years.
