Segment:
Performance Off-Road Motorcycle (Motocross/Dirt Bike)
Competitors:
Competes with other 100cc class junior motocross bikes from brands like Yamaha (YZ100), Honda (CR100), and Suzuki (RM100) during its production run.
Features:
Lightweight chassis, powerful two-stroke engine, long-travel suspension, designed for competitive junior motocross racing.
Engine:
Top-end, bottom-end, cooling system, lubrication, ignition, fuel system, exhaust system.
Transmission:
Clutch, gearbox, shifting mechanism, lubrication.
Chassis:
Frame, suspension (front forks, rear shock), steering, wheels, tires, brakes (front and rear).
Electrical:
Wiring diagrams, lighting, ignition system components, charging system.
Bodywork:
Plastic panels, seating, handlebars, footpegs.
Maintenance:
Regular scheduled maintenance, oil changes, filter replacements, chain adjustment, spark plug service, coolant checks.
Repair:
Engine disassembly and reassembly, carburetor tuning, clutch service, brake caliper overhauls, suspension rebuilds, electrical component troubleshooting.
Troubleshooting:
Diagnostic flowcharts for common starting, running, and performance issues.
Specifications:
Torque values, clearances, fluid capacities, electrical specifications.
Depth:
Comprehensive; covers from basic routine maintenance to complete engine and chassis overhauls, including detailed diagnostic procedures.
Engine Type:
Liquid-cooled, 2-stroke, single-cylinder
Displacement:
99 cc (6.04 cu in)
Bore X Stroke:
52.0 x 45.8 mm (2.05 x 1.80 in)
Compression Ratio:
8.5:1 (Typical, may vary slightly by year)
Horsepower:
Approximately 22-25 HP (Estimates based on class and era)
Torque:
N/A (Not typically advertised for this class)
Carburetor:
Keihin PWK34 (Typical for 2001-2010 models)
Fuel Type:
Unleaded gasoline with appropriate 2-stroke oil mix (e.g., 40:1 ratio, consult manual for specifics)
Fuel Tank Capacity:
Approx. 6.5 Liters (1.7 US gal)
Type:
6-speed constant mesh
Optional Transmissions:
N/A (Single transmission option)
Clutch Type:
Wet, multi-disc, manual clutch
Transmission Oil Type:
SAE 10W-40 API SF or SG (Consult manual for exact specification, often a dedicated motorcycle transmission oil is recommended)
Length:
Approx. 1850 mm (72.8 in)
Width:
Approx. 770 mm (30.3 in)
Height:
Approx. 1140 mm (44.9 in)
Wheelbase:
Approx. 1310 mm (51.6 in)
Ground Clearance:
Approx. 320 mm (12.6 in)
Dry Weight:
Approx. 77 kg (169.8 lbs)
Curb Weight:
N/A (Not typically listed for competition bikes)
Load Capacity:
N/A (Designed for single rider, no passenger or cargo capacity)
Safety Ratings:
N/A (Off-road competition vehicles are not subject to standard road safety ratings)
Active Safety:
Powerful braking system for control, responsive handling.
Passive Safety:
Durable frame construction, effective suspension to absorb impacts, rider protective gear is essential.
Infotainment System:
N/A (Pure performance off-road motorcycle with no infotainment features).
Driver Assistance Features:
N/A (No electronic driver assistance features).
Connectivity:
N/A (No connectivity features).
Ignition System:
CDI (Capacitor Discharge Ignition) with electronic timing adjustment. Refer to manual for specific timing marks and procedures.
Oil Change Interval:
Every 10-15 hours of riding or annually. Consult manual for specific engine oil type (e.g., transmission oil).
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions. Use K&N or similar cleaner/oil kit.
Chain Maintenance:
Clean and lubricate after every ride, adjust tension as needed (approx. 20-30mm slack).
Spark Plug Replacement:
Check gap and condition every 20-30 hours; replace as needed. NGK BR9EG or similar is common.
Engine Oil Type:
Transmission oil: SAE 10W-40 API SF or SG. 2-stroke oil: Pre-mix for fuel tank, ratio specified in manual.
Coolant Type:
Mixture of distilled water and anti-freeze (ethylene glycol-based), typically a 50/50 mix. Consult manual for specific type and capacity.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (Consult manual for specific caliper type and recommendation).
Common Wear Items:
Clutch plates, piston rings, top-end components (due to high-performance nature), chain and sprockets, suspension seals.
Carburetor Tuning:
Can be sensitive to altitude, temperature, and fuel quality. Proper jetting is critical for optimal performance.
Engine Longevity:
Properly maintained, especially with correct 2-stroke oil mixture and regular top-end inspections, the engine is durable. Neglect of 2-stroke oil can lead to rapid wear.
Kawasaki Heritage:
Kawasaki has a long and successful history in off-road racing, particularly with its KX line of motocross bikes, known for their performance and reliability.
Kx100 Evolution:
The KX100 has been a staple in Kawasaki's junior motocross lineup, consistently updated with chassis and engine improvements to remain competitive in its class.
Production Period:
Continuous production within the covered years 2001-2010, with minor updates to styling and components.
Racing Success:
The KX100 platform has been a popular choice for junior racers and has seen significant success in amateur and professional motocross events globally.
Performance Ratings:
Consistently rated as a top contender in its displacement class for performance, handling, and engine power by motorcycle publications and enthusiasts.
Certifications:
N/A (As a competition vehicle, it is not road-legal and does not require certifications like emissions compliance for street use).