Motorcycle Segment:
Entry-level, lightweight motorcycle, often categorized as a standard or commuter bike. Popular in developing markets and for riders seeking economical transportation.
Key Competitors:
Competed with other 125cc motorcycles from brands like Yamaha (e.g., YBR125), Honda (e.g., CB125), Kawasaki, and various other manufacturers depending on the specific market.
Target Audience:
New riders, commuters, those seeking fuel efficiency and low running costs.
Design Philosophy:
Reliability, simplicity, affordability, and practicality for everyday use.
Manual Value:
Essential for owners and mechanics needing to accurately identify and source original Suzuki replacement parts, crucial for maintaining the integrity and longevity of the motorcycle.
Content Scope:
Comprehensive parts identification and cataloging for the Suzuki GN125 motorcycle model range.
Market Coverage:
Likely covers components for models sold in North America, Europe, Asia, and other international markets during the specified production years. Specific regional variations might be noted.
Estimated Pages:
Typically between 200-400 pages for a master parts manual of this scope and era, depending on the number of variants and detail.
Type:
Master Parts Manual (Parts Catalog)
Purpose:
To identify and list all genuine Suzuki replacement parts for the specified GN125 models, including diagrams, part numbers, and quantities.
Language:
English (primary)
Engine Assembly:
Cylinder, piston, crankshaft, camshaft, valves, gaskets, seals, lubrication system components.
Fuel System:
Carburetor assembly, fuel tank, fuel lines, petcock, fuel filter.
Ignition System:
Spark plug, ignition coil, CDI unit, wiring harnesses, rotor, stator.
Transmission Drivetrain:
Gearbox components (gears, shafts, shift drum), clutch assembly (plates, springs), primary drive, final drive sprocket and chain.
Chassis Frame:
Frame assembly, sub-frame, footpegs, side stand, center stand, engine mounting hardware.
Suspension Front:
Front fork assembly, fork tubes, springs, seals, gaiters, steering bearings.
Suspension Rear:
Swingarm, rear shock absorber(s), bushings, linkage (if applicable).
Braking System Front:
Brake lever, master cylinder, brake hose, caliper, brake pads, brake disc.
Braking System Rear:
Brake pedal, rear brake linkage, brake drum assembly or caliper, brake shoes/pads, brake disc (if applicable).
Wheels Tires:
Wheel rims (front and rear), spokes, hubs, bearings, tire sizes, valve stems.
Electrical System:
Headlight, tail light, turn signals, battery, rectifier/regulator, wiring harness, switches, horn, instrumentation.
Bodywork Exterior:
Fuel tank, seat, side covers, fenders, chain guard, emblems, decals.
Controls:
Handlebars, grips, levers, cables (throttle, clutch), footpegs, gear shift lever, brake pedal.
Part Identification:
Detailed exploded view diagrams illustrating the location and assembly of all components.
Part Number Listing:
Comprehensive list of genuine Suzuki part numbers for each component.
Quantity Information:
Indication of the quantity of each part required for assembly.
Interchangeability:
May indicate commonality or interchangeability of parts across different sub-models or years within the specified range.
Depth:
Highly detailed for parts identification and ordering. Does not typically include repair procedures, diagnostic steps, or torque specifications, which are found in a separate service manual.
Type:
4-stroke, SOHC (Single Overhead Cam), air-cooled
Displacement:
Approximately 124 cc (exact figures may vary slightly based on specific internal Suzuki designations)
Bore X Stroke:
Typically around 52.0 mm x 50.2 mm (specifics to be confirmed in manual if provided).
Horsepower:
Estimated 10-12 HP at around 8,000-9,000 RPM (actual figures vary by market and tuning).
Torque:
Estimated 8-9 Nm at around 7,000 RPM (actual figures vary by market and tuning).
Carburetor Type:
Mikuni VM series (e.g., VM26 or similar) or Keihin carburetors, single unit.
Fuel Tank Capacity:
Typically around 10-12 liters (2.6-3.2 US gallons).
Overall Length:
Approximately 1900-2000 mm (74.8-78.7 inches)
Overall Width:
Approximately 750-800 mm (29.5-31.5 inches)
Overall Height:
Approximately 1050-1100 mm (41.3-43.3 inches)
Wheelbase:
Approximately 1280-1300 mm (50.4-51.2 inches)
Dry Weight:
Approximately 110-120 kg (242.5-264.5 lbs)
Wet Weight:
Approximately 120-130 kg (264.5-286.6 lbs)
Max Load:
Typically rated for a rider and light cargo, around 150-180 kg (330-400 lbs) total.
Crash Safety Ratings:
Motorcycles of this era and class are not typically subjected to formal crash test ratings like automobiles. Safety is inherent in design and rider operation.
Braking System:
Front disc brake, rear drum brake (common configuration, may vary slightly).
Lighting:
Standard headlight, tail light, and turn signals for visibility.
Frame Construction:
Steel frame designed for structural integrity.
Tire Selection:
Appropriate tire sizes and types specified in the manual for optimal grip and handling.
Oil Change Interval:
Typically every 2,000-3,000 km (1,200-1,800 miles) or 6 months, whichever comes first. Exact interval would be in the service manual.
Spark Plug Replacement:
Recommended every 6,000-10,000 km (3,700-6,200 miles). Specific plug type detailed in service manual.
Valve Clearance Check:
Typically at 10,000-15,000 km (6,200-9,300 miles). Critical for maintaining engine performance and longevity.
Engine Oil Type:
API SE, SF, or SG grade, SAE 10W-40 or 20W-40 motorcycle-specific oil recommended. Always consult the service manual for the precise specification.
Engine Oil Capacity:
Approximately 1.0 - 1.2 liters (1.05 - 1.27 US quarts) with filter change.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic fluid (if equipped with disc brake).
Chain Lube:
Appropriate motorcycle chain lubricant for regular cleaning and lubrication.
Carburetor Tuning:
Carburetors can become gummed up over time, requiring cleaning and adjustment, especially if the bike sits for extended periods.
Electrical Connections:
Corrosion or loose connections in the wiring harness can lead to intermittent electrical issues (lights, ignition).
Suspension Seals:
Front fork seals can leak over time, requiring replacement.
Clutch Wear:
Clutch plates can wear out with high mileage or aggressive use, leading to clutch slip.
Suzuki Legacy:
Suzuki has a long history of producing reliable and accessible motorcycles, from small commuters to performance machines.
Gn Series:
The GN series is known for its robust, simple, and economical nature, serving as a foundational model for many riders. The GN125 specifically gained popularity for its ease of use and low maintenance.
Manufacturing Locations:
Primarily manufactured in Japan, with potential for production in other Suzuki facilities globally, depending on the target market.
Market Introduction:
The GN125 line was introduced in the 1980s and continued with updates through the 1990s, with this manual covering the mid-life cycle.
