Segment:
Entry-level to intermediate motocross racing, youth performance off-road.
Target Audience:
Young riders progressing in motocross, recreational off-road enthusiasts, mechanics, and DIY enthusiasts.
Competitors:
Yamaha YZ100/YZ125, Suzuki RM100/RM125, Honda CR100/CR125.
Engine Type:
Liquid-cooled, 2-stroke, single-cylinder.
Frame Type:
High-tensile steel perimeter frame.
Suspension Front:
Upside-down telescopic forks with adjustable compression and rebound damping.
Suspension Rear:
Uni-Trak system with adjustable preload, compression, and rebound damping.
Transmission:
6-speed constant mesh.
Usefulness:
Essential for owners and technicians to maintain, diagnose, and repair the KX100, ensuring optimal performance and longevity.
Engine:
Complete engine overhaul, disassembly, assembly, tuning, troubleshooting, lubrication, cooling system (liquid-cooled).
Fuel System:
Carburetor (Keihin PWK35), fuel tank, fuel lines, fuel pump (if applicable for specific model revisions).
Transmission:
6-speed gearbox, clutch operation and adjustment, gearbox disassembly and assembly, gear ratios, shift mechanism.
Drivetrain:
Final drive (chain and sprockets), chain tension adjustment, sprocket replacement.
Suspension:
Front forks (upside-down telescopic), rear shock absorber, linkage, suspension tuning, fork seal replacement, shock absorber overhaul.
Brakes:
Front and rear disc brakes, brake caliper service, master cylinder overhaul, brake pad replacement, brake fluid bleeding and specifications.
Electrical System:
Ignition system (CDI), lighting, charging system (stator, flywheel), battery maintenance, wiring diagrams, troubleshooting electrical faults, starter system (kick start).
Cooling System:
Radiator, coolant hoses, coolant type and capacity, fan operation (if applicable).
Chassis And Frame:
Frame inspection, sub-frame, swingarm maintenance, steering head bearing service.
Wheels And Tires:
Wheel bearing service, tire pressure specifications, tire replacement, spoke tensioning.
Exhaust System:
Exhaust pipe, silencer maintenance, packing replacement.
Bodywork And Plastics:
Fairing removal and installation, seat, fenders.
Routine Maintenance:
Oil changes, filter replacement, chain cleaning and lubrication, spark plug checks, air filter cleaning, brake checks, tire pressure adjustments.
Troubleshooting:
Diagnostic flowcharts for common issues, identifying and resolving performance problems, electrical gremlins, starting difficulties.
Engine Repair:
Top-end rebuild (piston, rings, cylinder), bottom-end rebuild (crankshaft, bearings), valve adjustments (if applicable to 2-stroke), carburetor tuning and rebuilding.
Transmission Repair:
Clutch replacement, gearbox component inspection and replacement, shift drum and fork service.
Suspension Service:
Fork oil replacement, fork seal replacement, shock absorber seal replacement, linkage bearing service.
Brake System Service:
Brake pad replacement, brake fluid flush and replacement, caliper and master cylinder overhaul.
Electrical Diagnostics:
Wiring diagram interpretation, component testing (coils, sensors), troubleshooting starting and charging issues.
Special Tools:
Identification of required special tools for specific procedures.
Depth:
Comprehensive from basic maintenance to complete engine and transmission rebuilds, including detailed troubleshooting guides and specifications.
Diagnostic Capability:
Includes procedures for diagnosing engine performance, electrical faults, and chassis issues using standard tools and diagnostic methods.
Specifications Detail:
Provides torque specifications, clearances, fluid capacities, electrical resistance values, and other critical technical data.
Engine Type:
Liquid-cooled, 2-stroke, single-cylinder, reed valve induction.
Bore X Stroke:
52.0 x 45.0 mm
Compression Ratio:
9.9:1 (Typical, may vary slightly by year)
Cylinder Head:
Cylinder with KIPS (Kawasaki Integrated Power Valve System).
Horsepower Approx:
27-30 HP (Estimate based on typical 100cc performance bikes)
Torque Approx:
15-17 lb-ft (Estimate)
Carburetor Model:
Keihin PWK35, single.
Fuel Type:
Unleaded gasoline (91 octane or higher recommended).
Fuel Mixture:
Pre-mix gasoline/oil (e.g., 50:1 ratio with 2-stroke oil).
Transmission Oil Type:
API GL-4, SAE 80W-90 hypoid gear oil.
Transmission Oil Capacity:
Approx. 0.8 Liters (0.8 US qt)
Ignition System:
Digital CDI (Capacitor Discharge Ignition).
Cooling Method:
Liquid-cooled.
Coolant Type:
High-quality ethylene glycol-based coolant with distilled water (50/50 mix).
Coolant Capacity:
Approx. 1.0 Liter (1.1 US qt)
Engine Oil Change:
Every 10-15 hours of riding or annually. Check owner's manual for specifics.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions.
Spark Plug Replacement:
Every 20-30 hours of riding, or as needed based on condition.
Chain Lubrication Tension:
Before every ride or every 5-10 hours of riding.
Brake Fluid Flush:
Annually or as recommended in the manual.
Suspension Service:
Fork oil change every 20-40 hours, complete fork/shock service every 100 hours or as needed.
Engine Oil Grade:
See manual for specific 2-stroke injection oil. For gearbox, SAE 80W-90 API GL-4.
Coolant Type:
Ethylene glycol-based antifreeze with distilled water (50/50 mix).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Engine Wear:
As with any high-performance 2-stroke, regular top-end rebuilds (piston, rings) are essential for maintaining peak performance.
Carburetor Tuning:
Carburetor requires precise jetting and adjustment for optimal running conditions; susceptible to fouling if not properly maintained.
Suspension Seals:
Fork seals can be prone to leaks, especially with aggressive off-road use.
Kips System:
The KIPS power valve system can accumulate carbon deposits, requiring periodic cleaning for proper operation.
Kawasaki Offroad Legacy:
Kawasaki has a long and successful history in motocross and off-road racing, with iconic models like the KX series dating back decades.
Kx100 Development:
The KX100 evolved from earlier KX models, focusing on lightweight design, potent 2-stroke power, and competitive chassis dynamics for its class.
Key Updates 01-13:
While the core design remained consistent, minor updates likely included carburetor tuning, suspension valving, and graphical changes across the model years.
Manufacturing Location:
Japan (Primarily, components may vary)
Model Longevity:
The KX100 platform proved durable and effective, with a production run spanning over a decade.
