Market Positioning:
The Suzuki RM125 was a dominant force in the 125cc motocross class during its production run, known for its performance, handling, and reliability. This manual targets owners and mechanics who want to maintain and repair these highly capable machines.
Competitors 125Cc Class:
Yamaha YZ125, Honda CR125R, Kawasaki KX125, KTM 125 SX.
Manual Value Proposition:
Enables significant cost savings for owners by facilitating DIY repairs. Provides clear, step-by-step instructions with accompanying images for all service and repair tasks.
Accessibility:
Downloadable for instant access, can be printed partially or fully, and viewable on various devices (PC, Mac, tablet, smartphone).
Coverage Years:
1999, 2000
Model Coverage Statement:
All models, engines, trim, and transmission types covered for the specified years.
Page Count Estimate:
Detailed page count not specified, but described as 'complete' and covering A-Z procedures.
Manual Type:
Complete Workshop Service Repair Manual
Format:
Digital Downloadable (PDF)
Engine System:
Complete engine overhaul, carburetor tuning, lubrication system, cooling system (if applicable), ignition system.
Transmission System:
Gearbox inspection, repair, clutch service, shift mechanism.
Chassis Suspension:
Front fork service (suspension internals, seals), rear shock absorber service, linkage maintenance, swingarm service.
Braking System:
Front and rear brake caliper service, master cylinder repair, bleeding procedures, pad replacement, rotor inspection.
Electrical System:
Ignition system troubleshooting, lighting (if applicable), wiring diagrams (likely included), CDI unit.
Fuel System:
Fuel tank inspection, fuel line maintenance, carburetor disassembly, cleaning, and reassembly.
Cooling System:
Radiator inspection, hose replacement, coolant (though typically air-cooled for this era RM125, but manual would cover if liquid-cooled variants exist or for specific models).
Exhaust System:
Exhaust pipe inspection, muffler maintenance, O-ring replacement.
Maintenance Procedures:
Routine maintenance tasks, oil changes, air filter cleaning/replacement, chain lubrication and adjustment, spark plug replacement, valve clearance (if applicable, though 2-stroke typically doesn't have adjustable valves).
Repair Procedures:
Engine rebuild, gearbox repair, suspension component overhaul, carburetor jetting and repair, clutch replacement.
Troubleshooting Guides:
Diagnostic procedures for common issues, electrical troubleshooting, engine performance problems.
Disassembly Reassembly:
Detailed step-by-step instructions for dismantling and reassembling all major components.
Special Tools:
Identification of specialized tools required for specific repair and maintenance tasks.
Depth Of Coverage:
Comprehensive A-Z coverage, suitable for both novice DIY mechanics and experienced technicians. Includes detailed instructions, diagrams, and specifications.
Engine Type:
2-Stroke, Single Cylinder, Reed Valve Induction
Displacement:
124 cc (approx. 7.58 cu. in.)
Bore X Stroke:
54.0 mm x 54.5 mm (approx. 2.13 in x 2.15 in)
Cooling System:
Liquid-cooled (typically for RM125 models of this era)
Horsepower Estimate:
Around 35-40 HP (actual figures vary by year and tune)
Torque Estimate:
Not typically advertised in precise figures for motocross bikes, but focused on peak power delivery.
Carburetor Type:
Mikuni VM Series (e.g., VM28SS or similar)
Fuel Type:
Unleaded gasoline (typically 91+ octane recommended) mixed with 2-stroke oil.
Ignition Type:
CDI (Capacitor Discharge Ignition), Digital
Lubrication System:
Premix (2-stroke oil mixed with gasoline) or Automatic Oil Injection (Suzuki's SAIS system may be present on some variants).
Transmission Type:
6-Speed Manual
Clutch Type:
Wet Multi-plate
Optional Transmissions:
N/A (Competition motorcycles typically have a single, optimized transmission configuration).
Gear Ratios:
Specific gear ratios would be detailed within the manual for each gear.
Transmission Fluid:
Gear Oil (e.g., SAE 80 or 10W-30 for the transmission).
Overall Length:
Refer to manual for exact dimensions, but typically around 2150 mm (84.6 in).
Overall Width:
Refer to manual for exact dimensions, but typically around 820 mm (32.3 in).
Overall Height:
Refer to manual for exact dimensions, but typically around 1245 mm (49.0 in).
Dry Weight:
Approximately 92 kg (202.6 lbs) - dry weight can vary slightly by year.
Fuel Capacity:
Approximately 8.0 liters (2.1 US gal).
Front Suspension Travel:
Approximately 280-300 mm (11.0-11.8 in).
Rear Suspension Travel:
Approximately 300-320 mm (11.8-12.6 in).
Safety Ratings:
N/A for competition off-road motorcycles; safety features are primarily design-based for performance and rider control.
Braking System:
Hydraulic disc brakes front and rear for powerful and reliable stopping performance.
Handlebar Design:
Wide motocross handlebars for leverage and control.
Frame Construction:
Sturdy twin-spar frame designed for rigidity and impact resistance.
Ergonomics:
Designed for optimal rider positioning and control during aggressive riding.
Infotainment System:
N/A (Competition motorcycle, no infotainment features).
Driver Assistance Features:
N/A (Competition motorcycle, driver assistance is not applicable).
Connectivity Options:
N/A (Competition motorcycle, no connectivity features).
Oil Change Interval:
Refer to manual; typically after every few race days or a set number of hours of operation for engine oil/transmission oil.
Air Filter Cleaning:
After every ride or as needed based on conditions. Manual will detail procedure.
Chain Maintenance:
Lubricate and adjust chain tension before each ride or as needed. Manual provides specific adjustment procedure.
Engine Oil Type:
High-quality 2-stroke premix oil (specific brand/type recommendations may be in manual).
Transmission Oil Type:
SAE 80 or 10W-30 Gear Oil (Specific API GL specification may be noted).
Coolant Type:
Ethylene Glycol based coolant (if liquid-cooled variant). Specific mixture ratio with distilled water is crucial.
Common Wear Items:
Clutch plates, piston rings, top-end components (cylinder, piston), wheel bearings, suspension seals, carburetor jets.
Carburetor Cleaning:
Frequent cleaning and jetting adjustments are often necessary due to the nature of motocross riding and fuel variability.
Suspension Maintenance:
Regular seal inspection and oil changes for forks and shock are vital for optimal performance.
Brand Focus:
Suzuki has a long and successful history in motorcycle racing, particularly in off-road and Grand Prix events.
Rm Series Legacy:
The RM series has been a cornerstone of Suzuki's motocross offerings for decades, consistently evolving to meet the demands of competitive racing.
Key Advancements 1999-2000:
These model years often featured refinements in suspension, engine tuning, and chassis geometry based on racing feedback.
Manufacturing Location:
Japan (Typical for Suzuki motorcycles of this era).
