Segment:
Performance Motocross Motorcycles
Target Audience:
Motocross riders, mechanics, and owners seeking to maintain and repair their KX125/KX250.
Competitors Era:
Honda CR series, Yamaha YZ series, Suzuki RM series, KTM SX series.
Manual Value Proposition:
Empowers owners and technicians with the knowledge to perform all necessary maintenance and repairs, optimizing performance and longevity.
Model Significance:
The KX line from this era was renowned for its competitive performance in motocross.
Engine Overhaul:
Detailed procedures for disassembly, inspection, repair, and reassembly of the two-stroke engine.
Cooling System:
Maintenance and repair of the liquid cooling system, including radiator, hoses, and coolant specifications.
Fuel System:
Carburetor adjustment, cleaning, and overhaul; fuel tank and petcock maintenance.
Ignition System:
Spark plug selection, ignition timing, CDI unit troubleshooting, and stator/rotor inspection.
Transmission Drivetrain:
Clutch operation, gearbox inspection, lubrication, and gearshift mechanism repair.
Suspension Front:
Fork seal replacement, oil level and type, damper rod adjustment, and spring preload.
Suspension Rear:
Monoshock linkage system maintenance, shock absorber overhaul, and spring adjustment.
Brakes Front:
Hydraulic brake system service, caliper inspection, pad replacement, and fluid bleeding.
Brakes Rear:
Drum brake or hydraulic disc brake service (depending on specific model variant), shoe/pad replacement, and adjustment.
Electrical System:
Wiring diagrams, lighting, horn, and basic troubleshooting for electrical components.
Wheels Tires:
Spoke tensioning, bearing maintenance, tire pressure recommendations, and wheel balancing.
Chassis Frame:
Frame inspection, steering head bearing maintenance, and general chassis component checks.
Bodywork Plastics:
Installation and removal of fenders, side panels, and fuel tank cover.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, and general inspection procedures.
Engine Rebuild:
Complete engine teardown and reassembly, including piston, rings, cylinder, and crankshaft service.
Carburetor Tuning:
Step-by-step guide for jetting, cleaning, and synchronizing the carburetor for optimal performance.
Suspension Servicing:
Fork and shock absorber disassembly, seal replacement, oil changes, and adjustment procedures.
Brake System Repair:
Bleeding procedures, pad/shoe replacement, caliper/cylinder servicing.
Troubleshooting Diagnostics:
Identification of common problems, symptoms, and corrective actions.
Depth Level:
Expert-level, covering full mechanical and electrical diagnostics and repair.
Special Tools:
Lists required special tools for specific procedures.
Torque Specifications:
Provides precise torque values for all critical fasteners.
Clearances Tolerances:
Specifies essential component clearances and wear tolerances.
Digital Format Details:
If PDF, expect searchable text, high-resolution diagrams, and printable pages.
Print Quality Details:
Professional printing with clear diagrams and legible text for ease of use in a workshop environment.
Binding Type Details:
Likely perfect binding or saddle-stitch for printed versions, designed for durability.
Paper Type Details:
Durable paper stock resistant to workshop conditions (grease, oil).
Kx125 Engine Type:
Liquid-cooled, 2-stroke, reed valve induction
Kx250 Engine Type:
Liquid-cooled, 2-stroke, reed valve induction
Kx125 Bore X Stroke:
52.5 mm x 57.0 mm (typical)
Kx250 Bore X Stroke:
67.4 mm x 70.0 mm (typical)
Kx125 Displacement:
124 cc (typical)
Kx250 Displacement:
249 cc (typical)
Kx125 Compression Ratio:
Approx. 8.5:1 (typical, varies with tuning)
Kx250 Compression Ratio:
Approx. 8.6:1 (typical, varies with tuning)
Kx125 Horsepower:
Approx. 35-40 HP (estimated, varies by tuning)
Kx250 Horsepower:
Approx. 45-50 HP (estimated, varies by tuning)
Carburetor Kx125:
Mikuni VM26SS (typical)
Carburetor Kx250:
Mikuni TM34SS (typical)
Fuel Type:
Unleaded gasoline, 91 octane or higher recommended
Fuel Mixture:
50:1 ratio (Gasoline to 2-stroke oil, specific oil type TBD by manual)
Oil Change Interval:
Recommended every 10-15 engine hours or as specified in manual (fork oil, transmission oil).
Air Filter Cleaning:
Recommended every 5-10 engine hours or after dusty rides.
Spark Plug Replacement:
Inspect every 10-20 hours, replace as needed.
Chain Lubrication Adjustment:
Lubricate every 500-800 km, adjust slack as needed per manual specs.
Engine Oil Type:
High-quality 2-stroke premix oil (specific grade like JASO FD or equivalent to be confirmed in manual)
Transmission Oil Type:
SAE 10W-30 or SAE 10W-40 API GL-4 gear oil (specific viscosity and API rating to be confirmed in manual)
Coolant Type:
Permanent type antifreeze coolant (specific mix ratio and type to be confirmed in manual)
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (confirm specific type in manual)
Two Stroke Wear Items:
Piston, piston rings, cylinder wear are common in high-performance 2-strokes; regular inspection is key.
Clutch Wear:
Clutch plates can wear out with aggressive riding; manual will detail inspection and replacement.
Suspension Seals:
Fork and shock seals are prone to leakage over time; manual provides seal replacement procedures.
Carburetor Jetting:
Carburetors may require re-jetting due to altitude, temperature, or engine modifications; manual guides this process.
Kawasaki Motorcycles:
Kawasaki Heavy Industries has a long and storied history in motorcycle manufacturing, particularly in performance-oriented off-road and sportbike segments.
Kx Lineage:
The KX line has been a dominant force in motocross for decades, with continuous development and evolution in engine technology, suspension, and chassis design.
1992 1993 Kx Advancements:
This generation of KX models saw significant updates, often including improved suspension (e.g., Kayaba USD forks), revised engine power delivery, and chassis refinements to enhance handling and competitiveness.
