Vehicle Class:
Motocross/Off-Road Competition Motorcycle
Target Audience:
Amateur and semi-professional motocross racers, off-road enthusiasts.
Key Competitors:
Honda CR85/CR80, Yamaha YZ100/YZ85, Suzuki RM100/RM85, KTM 105 SX/85 SX.
Engine Type:
Two-stroke, single-cylinder, liquid-cooled (typically, though some earlier models might have been air-cooled depending on region/specifics).
Suspension Travel:
Long-travel front and rear suspension designed for aggressive off-road riding.
Frame Construction:
Lightweight, high-tensile steel or aluminum perimeter frame for rigidity and handling.
Off Road Focus:
Optimized for racing and off-road trail riding, featuring knobby tires, high ground clearance, and durable components.
Engine System:
Complete engine overhaul, diagnosis, tuning, lubrication, cooling (if applicable, though usually air-cooled), fuel delivery, ignition system.
Transmission System:
Clutch operation, gearbox disassembly and reassembly, shift mechanism, lubrication.
Chassis System:
Frame inspection and repair, suspension (front fork, rear shock absorber) maintenance and adjustments, steering system service.
Brake System:
Front and rear brake systems (likely disc brakes), caliper service, fluid replacement, bleeding procedures.
Electrical System:
Wiring diagrams, ignition system components (CDI, spark plug), lighting system, battery maintenance, troubleshooting electrical faults.
Fuel System:
Carburetor identification, disassembly, cleaning, adjustment (jetting), fuel tank and petcock service.
Exhaust System:
Exhaust pipe and silencer inspection, maintenance, and potential replacement guidance.
Cooling System:
Primarily air-cooled, but may cover radiator if liquid-cooled variants exist or for specific model years.
Bodywork And Trim:
Fairing removal and installation, seat, fenders, plastics, graphics.
Maintenance Procedures:
Regular service checks, oil changes, filter replacements, chain adjustment, spark plug replacement, brake pad replacement, coolant flush (if applicable).
Troubleshooting Guides:
Diagnostic flowcharts and symptom-based troubleshooting for common issues across all major systems.
Repair Procedures:
Step-by-step disassembly and reassembly instructions for major components and sub-assemblies.
Rebuild Instructions:
Detailed procedures for rebuilding the engine, carburetor, suspension components, and brake calipers.
Adjustment Procedures:
Carburetor tuning, ignition timing, suspension sag, chain tension, clutch and brake lever free play.
Wiring Diagrams:
Comprehensive electrical schematics for easy fault diagnosis.
Diagnostics:
Advanced diagnostic procedures, including electrical testing, compression testing, and carburetor performance analysis.
Performance Tuning:
Information on optimizing engine performance through carburetor jetting, exhaust modifications, and ignition timing adjustments.
Specification Data:
Torque specifications, clearances, fluid capacities, and electrical resistance values for all components.
Engine Type:
Two-stroke, single-cylinder
Bore X Stroke:
52.5 mm x 45.8 mm
Cooling System:
Liquid-cooled
Reed Valve System:
Yes, typically KIPS (Kawasaki Integrated Power-valve System) or similar design for optimized powerband.
Starting System:
Kickstart
Horsepower Peak:
Approximately 25-30 HP (varied by tuning and year)
Torque Peak:
Approximately 14-16 lb-ft (varied by tuning and year)
Carburetor Model:
Keihin PWK35 (typical for this model/era)
Fuel Type:
Unleaded gasoline, 91 octane or higher recommended.
Premix Ratio:
50:1 with a high-quality two-stroke oil.
Overall Length:
Approximately 73.2 inches (1860 mm)
Overall Width:
Approximately 31.7 inches (805 mm)
Overall Height:
Approximately 44.7 inches (1135 mm)
Wheelbase:
Approximately 50.6 inches (1285 mm)
Ground Clearance:
Approximately 12.2 inches (310 mm)
Seat Height:
Approximately 34.2 inches (869 mm)
Dry Weight:
Approximately 157.4 lbs (71.4 kg)
Curb Weight:
Not typically specified for motocross bikes, but would include fluids.
Safety Certifications:
N/A for competition off-road motorcycles as they are not street legal.
Braking System:
Hydraulic disc brakes front and rear for powerful stopping.
Suspension Responsiveness:
Adjustable suspension allows tuning for rider weight and track conditions, enhancing control.
Ergonomics:
Designed for an active riding position, offering rider control and comfort during competition.
Infotainment System:
N/A (Basic motocross bike, no integrated electronics like infotainment).
Driver Assistance Features:
N/A (No electronic rider aids on this model).
Connectivity Options:
N/A.
Ignition System:
Digital CDI (Capacitor Discharge Ignition) for precise spark timing.
Power Valve System:
KIPS (Kawasaki Integrated Power-valve System) or similar to optimize power delivery across the RPM range.
Oil Change Interval:
Dependent on usage, but typically every 5-10 hours of riding for transmission oil. Engine oil is mixed with fuel.
Air Filter Cleaning:
Recommended every few rides, especially in dusty conditions.
Spark Plug Replacement:
Recommended every 20-30 hours of riding, or as needed based on performance.
Chain Lubrication Adjustment:
Lubricate before every ride, adjust tension every 5-10 hours of riding.
Top End Rebuild:
Recommended typically between 40-60 hours of riding for optimal performance and reliability.
Engine Oil Type:
High-quality, JASO FD rated two-stroke premix oil.
Transmission Oil Spec:
API GL-4, SAE 80W/90 gear oil (confirm with manual).
Coolant Type:
If liquid-cooled, a 50/50 mixture of ethylene glycol-based antifreeze and distilled water. (Confirm with manual)
Brake Fluid Type:
DOT 4 hydraulic brake fluid.
Two Stroke Wear:
Piston and ring wear is a common concern in two-stroke engines due to high operating temperatures and stresses. Regular top-end rebuilds are crucial.
Carburetor Fouling:
Can occur due to incorrect jetting, old fuel, or a dirty air filter, leading to poor running or bogging.
Suspension Seals:
Fork and shock seals can wear over time, leading to oil leaks and decreased damping performance. Regular maintenance and seal replacement are recommended.
Clutch Wear:
Clutch plates can wear out with aggressive riding, requiring replacement to maintain proper engagement.
Kawasaki Motocross Legacy:
Kawasaki has a long and successful history in motocross racing with its KX line, known for potent two-stroke engines and competitive chassis.
Kx100 Development:
The KX100 is a staple in the junior motocross category, evolving over the years with chassis improvements, suspension updates, and engine tuning to maintain competitiveness.
Production Period:
The KX100 has been in continuous production for many years, with the 2001-2010 period representing a significant generation of this model.
Manufacturing Location:
Likely Japan or potentially other Kawasaki manufacturing facilities globally.
Motocross Class Performance:
The KX100 line has historically been recognized for its strong performance in its class, often winning shootouts and race events in the 85cc/100cc category.
Industry Reviews:
Motorcycle publications of the era likely rated the KX100 highly for its potent engine, capable suspension, and competitive chassis.
Emissions Compliance:
N/A (Competition off-road vehicles are typically exempt from road-legal emissions standards).
