Segment:
High-performance Motocross
Target User:
Motocross racers, off-road enthusiasts, and home mechanics maintaining the KX125 and KX250.
Competitors Era:
Honda CR series, Yamaha YZ series, Suzuki RM series, KTM SX series.
Manual Value Proposition:
Cost-effective maintenance and repair, empowering owners to perform complex tasks, ensuring optimal performance and longevity of their motorcycles.
Engine:
Complete disassembly, inspection, repair, and reassembly of all engine components, including top-end (cylinder, piston, rings, head), bottom-end (crankshaft, connecting rod, bearings), cooling system (if applicable), lubrication system, and ignition system.
Transmission:
Gearbox inspection, repair, and adjustment; clutch operation, adjustment, and replacement; shift mechanism.
Fuel System:
Carburetor disassembly, cleaning, tuning, and jetting; fuel tank, fuel lines, and petcock inspection and service.
Ignition System:
Ignition coil, CDI unit, spark plug, stator, and wiring inspection and testing.
Suspension:
Front fork (KYB or similar) disassembly, servicing, and adjustment (compression, rebound); rear shock absorber servicing and adjustment; linkage system inspection.
Brakes:
Front and rear brake system inspection, maintenance, and repair, including caliper, master cylinder, brake lines, and pads.
Electrical System:
Wiring diagrams, component testing, lighting system, kill switch, and basic electrical troubleshooting.
Cooling System:
Radiator inspection, coolant capacity, hose inspection, and fan operation (if applicable).
Frame And Bodywork:
Frame inspection, handlebar replacement, seat removal, plastic panel removal and installation.
Maintenance:
Routine maintenance procedures, oil changes, filter replacements, chain adjustment, brake bleeding, general inspection.
Troubleshooting:
Diagnostic charts and procedures for common issues and performance problems.
Repair:
Detailed step-by-step repair instructions for all major and minor component overhauls.
Disassembly Reassembly:
Complete guides for taking apart and putting back together various assemblies.
Specifications Data:
Torque specifications, clearances, fluid capacities, and other critical measurements.
Depth:
Comprehensive, suitable for both amateur mechanics and professional technicians; covers from basic servicing to complete engine rebuilds and suspension overhauls.
Type:
Liquid-cooled, 2-stroke, single-cylinder
Bore X Stroke:
54.0 x 54.5 mm
Ports:
Power Valve System (KIPS)
Type:
Liquid-cooled, 2-stroke, single-cylinder
Bore X Stroke:
66.4 x 72.0 mm
Ports:
Power Valve System (KIPS)
Horsepower Kx125 Approx:
~38-40 HP
Horsepower Kx250 Approx:
~48-50 HP
Carburetor Kx125:
Keihin PWK35
Carburetor Kx250:
Keihin PWK37
Fuel Type:
Unleaded gasoline (min. 91 octane recommended), mixed with 2-stroke oil at specified ratio (typically 20:1 or 32:1 depending on oil quality).
Length:
Approx. 2,175 mm (85.6 in)
Width:
Approx. 800 mm (31.5 in)
Height:
Approx. 1,225 mm (48.2 in)
Wheelbase:
Approx. 1,465 mm (57.7 in)
Length:
Approx. 2,180 mm (85.8 in)
Width:
Approx. 800 mm (31.5 in)
Height:
Approx. 1,225 mm (48.2 in)
Wheelbase:
Approx. 1,470 mm (57.9 in)
Dry Weight Kx125:
Approx. 95 kg (209.4 lbs)
Dry Weight Kx250:
Approx. 103 kg (227.1 lbs)
Front Tire Kx125 Kx250:
80/100-21 51M
Rear Tire Kx125:
100/90-17 55M
Rear Tire Kx250:
110/90-17 60M
Infotainment Features:
N/A (Pure Motocross/Off-road focus, no electronic entertainment systems).
Assistance Features:
N/A (Focus on rider input and mechanical systems).
Connectivity Features:
N/A
Kips System:
Kawasaki Integrated Power-valve System (KIPS) optimizes power delivery across the rev range.
Suspension Technology:
High-performance cartridge front forks and adjustable rear shock absorbers (e.g., KYB or Showa) with significant travel.
Oil Change Interval:
Refer to manual for transmission oil and 2-stroke oil recommendations. Engine oil (if applicable for gearbox lubrication) typically checked at every ride and changed periodically.
Air Filter Cleaning:
Frequent cleaning and oiling recommended, especially after riding in dusty conditions (e.g., every few hours of use).
Spark Plug Replacement:
Recommended every 20-40 hours of use, or as per manual recommendations.
Chain Adjustment:
Check and adjust slack regularly as per manual specifications (typically 10-20mm).
Top End Rebuild:
Varies greatly with usage, but typically between 40-100 hours for optimal performance.
Coolant:
Permanent type, ethylene glycol based, 50/50 mix with distilled water. Capacity: Approx. 1.5 L (refer to manual).
2 Stroke Oil:
High-quality 2-stroke motorcycle oil, pre-mix. Consult manual for specific ratio and brand recommendations.
Kx125 Common Wear:
Piston and cylinder wear due to high RPM operation, clutch wear, KIPS power valve system maintenance, suspension seal leaks.
Kx250 Common Wear:
Similar to KX125 but potentially more significant wear on engine components due to higher power output. Clutch fade, KIPS system, suspension wear.
Filter Oil Part Number Example:
Refer to manual for specific part numbers (e.g., for oil filters, air filters, gaskets).
Kawasaki Motocross Legacy:
Kawasaki has a long and successful history in motocross racing, with the KX line consistently being a top contender.
Kx Line Development:
The KX125 and KX250 were at the forefront of motocross technology in the early 90s, featuring advancements like liquid cooling, powerful engines, and advanced suspension systems.
Manufacturing Location:
Japan
Racing Success Era:
Kawasaki KX models of this era were highly competitive in professional motocross and supercross championships worldwide.
Magazine Reviews Era:
Consistently received high marks in motocross magazine shootouts for their power, handling, and suspension performance.
Manual Certification:
N/A (This refers to the quality and comprehensiveness of the manual itself, not a formal certification).
