Target Audience:
New riders, commuters, and DIY owners seeking a simple, low-maintenance 250cc street bike
Segment:
Entry-level standard / commuter motorcycle
Main Competitors:
Honda CB250, Yamaha SR250, Kawasaki 250 singles
Key Advantage:
Simple pushrod-free single with shaft-style simplicity, low seat height, and inexpensive parts
Reliability:
Proven SOHC single with reputation for durability and easy servicing
Engine:
249cc air-cooled SOHC single-cylinder four-stroke
Transmission:
5-speed constant mesh
Frame:
Simple tubular steel frame suited to beginner maintenance
Coverage Areas:
Engine, fuel system, ignition, transmission, chassis, suspension, brakes, wheels, electrical
Model Years:
1982-1983 Suzuki GN250
Manual Type:
Factory-style shop service manual
Delivery Method:
Instant digital download
Binding:
Digital (PDF, no physical binding)
Engine:
Cylinder head, valves, camshaft, piston, crankshaft, oil pump
Fuel System:
Carburetor overhaul, tuning, fuel tank and petcock
Ignition:
Contact breaker / CDI ignition timing and testing
Electrical:
Wiring diagrams, charging system, battery, switches, lighting
Transmission:
Gearbox disassembly, shift forks, primary drive, clutch
Front Suspension:
Telescopic fork service, seals, oil change
Rear Suspension:
Swingarm bearings, dual shock inspection and replacement
Brakes:
Front and rear drum brake inspection, shoe replacement, adjustment
Wheels and Tires:
Spoke wheel truing, bearing replacement, tire service
Frame:
Frame inspection and fastener torque specifications
Periodic Maintenance:
Full service interval charts and step-by-step maintenance procedures
Troubleshooting:
Symptom-based diagnostic charts for engine, electrical, and chassis
Engine Rebuild:
Complete teardown, measurement, and reassembly with wear limits
Torque Specifications:
Torque values listed for all major fasteners
Special Tools:
Special tool part numbers and usage instructions
Level:
Full shop-level depth for professional technicians and advanced DIY owners
Illustrations:
Exploded views, wiring diagrams, and detail photographs
Specifications Tables:
Service limits and factory specifications throughout each chapter
Part References:
Component identification in exploded views to assist parts ordering
Wear Limits:
Listed for piston, rings, valves, brake shoes, and bearings
Fluid Capacities:
Engine oil and fork oil capacities specified
Parts Catalog:
N/A - not a parts catalog; use alongside an official Suzuki parts fiche
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Options:
Single engine: 249cc air-cooled SOHC single-cylinder four-stroke
Bore x Stroke:
72.0 mm x 61.2 mm
Carburetor:
Single Mikuni constant-velocity (CV) carburetor
Fuel System Type:
Carbureted, gravity-fed from tank petcock
Rated Output:
Approximately 23-24 hp at 8,500 rpm (factory rating)
Starting System:
Electric start with kick starter backup
Standard Transmission:
5-speed constant mesh gearbox
Optional Transmission:
N/A - not specified for this model
Clutch:
Wet multi-plate clutch
Primary Drive:
Hydaulic-style helical gear primary drive
Gearbox Features:
Return-type shift pattern, cable-operated clutch
Wheelbase:
Approximately 1,385 mm (54.5 in)
Overall Length:
Approximately 2,115 mm (83.3 in)
Seat Height:
Approximately 745 mm (29.3 in), low seat for easy ground reach
Curb Weight:
Approximately 130-140 kg (287-309 lb) depending on market and fluids
Fuel Capacity:
Approximately 11 liters (2.9 US gal)
Crash Test Information:
N/A - motorcycles of this era were not crash tested
Brakes:
Front and rear internal-expanding drum brakes
Tires:
Tube-type tires front and rear
Lighting:
Headlight, taillight, and turn signals per 1982-1983 regulations
Frame:
Tubular steel backbone/cradle frame
Mirrors:
Equipped as standard
Advanced Safety Systems:
N/A - not available on this model
Audio System:
N/A - not equipped on this model
Instrumentation:
Speedometer with odometer, tachometer, neutral and high-beam indicator lights
Driver Assistance Systems:
N/A - not available on this model
Ignition:
Electronic CDI ignition (later units) improving reliability over breaker points
Engine Oil:
Change every 3,000 km (2,000 miles), initial change at 1,000 km
Valve Clearance:
Check every 6,000 km (4,000 miles)
Chain:
Clean, lube, and adjust every 500 km (300 miles) or as needed
Spark Plug:
Inspect/clean every 3,000 km, replace as needed
Carburetor:
Check idle and synchronization periodically per manual chart
Engine Oil:
SAE 10W-40 SE/SF grade, approximately 1.7-1.8 L at oil change
Fork Oil:
Suzuki fork oil, specified grade and quantity per leg in manual
Brake Fluid:
N/A - drum brakes, no hydraulic fluid required
Known Issues:
Carburetor gumming from stale fuel; check petcock and float bowl regularly
Common Wear:
Drive chain and sprockets, brake shoes, fork seals, cam chain tension
Charging System:
Aging wiring and regulator/rectifier connections on 40-year-old machines
Manufacturer:
Suzuki Motor Corporation, Hamamatsu, Japan
Motorcycle Heritage:
Suzuki built its reputation on compact, reliable singles and small-displacement bikes since the 1950s
GN Series Origin:
The GN250 launched in the early 1980s as a classic-style commuter single, echoing the ST250/temper line
Production Run:
GN250 continued in various markets for many years after 1983 with minor updates
Manufactured In:
Japan (Toyama/Hamamatsu Suzuki plants)
