Positioning:
A high-value resource for KX125 and KX250 owners and mechanics, aiming to provide factory-level detail for DIY repairs and professional servicing.
Comparison:
Positioned against other aftermarket manuals and potentially costly factory service manuals, emphasizing completeness and accuracy ('BEST manuals on Tradebit', 'Don't waste your money on incomplete cheap versions').
Features:
Complete factory-level service and repair information, detailed diagrams, comprehensive troubleshooting, covering multiple model years.
Primary Coverage:
Comprehensive Service and Repair for KX125 and KX250 models
Secondary Coverage:
Maintenance, diagnostics, troubleshooting, component overhaul, electrical systems
Estimated Pages:
Refer to actual product for exact page count, typically 300-600 pages per model
Type:
Service Repair Manual (Factory Workshop Manual Equivalent)
Format:
Digital (likely PDF)
Engine Mechanical:
Top-end (cylinder, piston, rings, head), bottom-end (crankshaft, connecting rod, bearings), lubrication, cooling, valve timing (if applicable)
Fuel System:
Carburetor (jetting, cleaning, assembly), fuel tank, fuel lines, fuel pump (if applicable)
Ignition System:
CDI unit, spark plug, ignition coils, wiring diagrams
Exhaust System:
Exhaust pipe, silencer (muffler) maintenance and repair
Transmission Drivetrain:
Gearbox, clutch (operation, friction plates, springs), final drive (chain, sprockets), shift mechanism
Suspension Front:
Front forks (disassembly, oil change, seal replacement, damping adjustment), steering system
Suspension Rear:
Rear shock absorber (rebuilding, adjustment), swingarm, linkage system (if applicable)
Brakes Front:
Brake caliper, master cylinder, brake lines, brake pads, rotor maintenance and replacement
Brakes Rear:
Rear brake caliper, master cylinder, brake lines, brake pads, rotor maintenance and replacement
Wheels Hubs:
Wheel bearing inspection and replacement, hub maintenance
Electrical System:
Wiring diagrams, lighting (if applicable), battery (if applicable), kill switch, basic electrical component testing
Frame Bodywork:
Frame inspection, body panel removal/installation, seat, handlebars, footpegs
Routine Maintenance:
Oil changes, air filter cleaning/replacement, chain adjustment, spark plug inspection, tire pressure checks
Major Overhaul:
Engine rebuild (top and bottom end), transmission disassembly and reassembly, suspension component rebuilding
Troubleshooting:
Diagnostic procedures for common problems, symptom-based troubleshooting guides
Component Replacement:
Step-by-step instructions for replacing wear items and major components
Calibration Adjustment:
Carburetor jetting adjustments, suspension sag and damping settings, clutch and throttle cable adjustments
Depth:
Comprehensive: Covers everything from basic adjustments to full engine and gearbox rebuilds, including electrical schematics and diagnostic information.
Kx125 Engine Type:
Liquid-cooled, 2-stroke, single-cylinder
Kx125 Displacement:
124 cc
Kx250 Engine Type:
Liquid-cooled, 2-stroke, single-cylinder
Kx250 Displacement:
249 cc
Kx125 Bore X Stroke:
54.0 x 54.5 mm (typical)
Kx250 Bore X Stroke:
66.4 x 72.0 mm (typical)
Kx125 Compression Ratio:
8.8:1 to 9.2:1 (typical, varies by year/model)
Kx250 Compression Ratio:
7.1:1 to 7.9:1 (typical, varies by year/model)
Carburetor Kx125:
Keihin PWK38 (typical, may vary by year)
Carburetor Kx250:
Keihin PWK39 (typical, may vary by year)
Fuel Type:
Unleaded gasoline, premium grade (91+ octane) recommended, mixed with 2-stroke oil.
2 Stroke Oil Type:
API TC, JASO FD certified 2-stroke engine oil (specific recommendations in manual).
Coolant Type:
Mixture of distilled water and ethylene glycol-based antifreeze (50/50 ratio recommended).
Kx125 Overall Length:
Approx. 2140 mm (84.3 in)
Kx250 Overall Length:
Approx. 2155 mm (84.8 in)
Kx125 Overall Width:
Approx. 800 mm (31.5 in)
Kx250 Overall Width:
Approx. 805 mm (31.7 in)
Kx125 Overall Height:
Approx. 1260 mm (49.6 in)
Kx250 Overall Height:
Approx. 1265 mm (49.8 in)
Kx125 Wheelbase:
Approx. 1450 mm (57.1 in)
Kx250 Wheelbase:
Approx. 1455 mm (57.3 in)
Kx125 Dry Weight:
Approx. 92 kg (202.6 lbs)
Kx250 Dry Weight:
Approx. 102 kg (224.9 lbs)
Fuel Tank Capacity:
8.0 L (2.1 US gal)
Oil Change Frequency:
Every 5-10 hours of riding or annually, depending on usage severity. Check manual for specific recommendations.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions.
Spark Plug Inspection:
Every 10-15 hours of riding. Replacement as needed.
Chain Lubrication Adjustment:
Before every ride or every few hours of riding.
Transmission Oil Type:
SAE 10W-40 API SG or higher motorcycle transmission oil. Check manual for exact specification and capacity.
Fork Oil Type:
Specific fork oil grade (e.g., Showa SS-8, Bel-Ray SAE 0W-20, or equivalent) with specific viscosity and quantity per fork leg as per manual.
Common Wear Items:
Piston rings, spark plugs, clutch plates, wheel bearings, chain and sprockets, fork seals, exhaust packing (silencer).
Performance Tuning:
Carburetor jetting is critical for optimal performance and can require adjustment based on altitude, temperature, and exhaust modifications. The manual provides baseline settings.
Kx250 Engine Specifics:
The 250cc 2-stroke engine demands regular top-end maintenance to preserve performance.
Kawasaki Motorsports:
Kawasaki has a long and successful history in motocross racing, with the KX line being a cornerstone of their performance off-road offerings.
Kx Series Development:
The KX125 and KX250 models evolved significantly throughout their production runs, with key updates including chassis improvements, engine enhancements (like KIPS - Kawasaki Intelligent Performance Exhaust), and suspension advancements to remain competitive.
Production Period:
These models represent a specific generation of Kawasaki's popular 2-stroke motocross bikes, preceding the transition to 4-stroke technology in some classes.
