Model:
Automatic Bullet A3
Model Variants:
Bullet A3 SP, Bullet A3 GM, Silver Bullet A3 SP, Silver Bullet A3 GM
Production Years:
A3 moped platform produced primarily in the 1970s-1980s; exact year range not specified in this manual
Vehicle Type:
Two-stroke automatic moped / scooter
Oil Injection Equipped:
Silver Bullet A3 SP and Silver Bullet A3 GM with oil injection
Fuel Mixing Requirement:
Premix required on non-oil-injection models; OilMaster injection on oil-injection variants
Target Audience:
Owners and technicians servicing Tomos A3 mopeds; entry-level two-wheeled transportation users
Intended Use:
Daily commuter moped with automatic transmission, aimed at riders seeking simple, low-cost transport
Service Skill Level:
Suitable for DIY owners; most maintenance requires basic hand tools
Engine:
Single-cylinder two-stroke engine with automatic transmission
Transmission:
Automatic (centrifugal) drive, no hand clutch required
Lubrication:
Oil injection on select models (Silver Bullet variants), premix on others
Competitive Advantage:
Simple two-stroke design with minimal components makes ownership and repair economical compared to scooter contemporaries
Engine:
Single-cylinder two-stroke engine, cylinder, piston, rings
Fuel System:
Carburetor, fuel tank, fuel lines, oil injection system (where equipped)
Ignition System:
Points/condenser ignition, spark plug service
Transmission:
Automatic centrifugal clutch and gear reduction drive
Final Drive:
Chain drive, sprockets, chain adjustment and lubrication
Brakes:
Front and rear drum brake inspection, adjustment, and shoe replacement
Wheels & Tires:
Wheel removal, tire and tube service, spoke maintenance
Electrical:
Lighting, horn, wiring, and magneto/stator circuits
Frame & Suspension:
Front fork, rear suspension, steering head bearings
Controls:
Throttle, brake levers, cables, and control adjustment
Scheduled Maintenance:
Periodic service charts and step-by-step maintenance tasks
Adjustments:
Carburetor tuning, idle setting, chain tension, brake adjustment
Lubrication:
Oil change intervals, gear oil specification, oil injection reservoir service
Two-Stroke Premixing:
Fuel/oil ratio instructions for non-oil-injection models
Inspection:
Pre-ride checks and periodic wear inspection points
Storage:
Off-season preparation and storage procedures
Troubleshooting:
Starting, running, and performance fault-finding guidance
Technical Depth:
Owner/technician maintenance level; covers service and adjustment rather than full engine teardown
Torque Specifications:
Provided where applicable to maintenance tasks
Parts Information:
Part identification for service items such as plugs, filters, cables, and brake shoes
Illustrations:
Diagrams and illustrations to support procedures
Applicability:
Covers A3 SP and A3 GM Bullet and Silver Bullet variants, including oil-injection models
Tools Required:
Common hand tools; special tools identified where needed
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 Type:
Single-cylinder, air-cooled two-stroke
Engine Options:
One engine; oil injection variant available on Silver Bullet models
Displacement:
Approximately 49cc (moped-class engine)
Fuel System & Performance
Fuel System:
Carburetor with float bowl
Lubrication:
Oil injection (Silver Bullet SP/GM) or premix fuel/oil mixture
Ignition:
Magneto ignition with spark plug
Top Speed:
Moped-class limited performance; exact figure not specified in this manual
Standard Transmission:
Automatic (centrifugal clutch) two-speed drive, per A3 Automatic designation
Optional Transmission:
None - automatic transmission fitted to all A3 Bullet models
Final Drive:
Chain drive to rear wheel
Clutch:
Centrifugal automatic clutch; no hand-operated clutch lever
Operation:
Twist-and-go operation; no manual shifting required
Gear Oil:
Gearcase oil with specified change interval covered in maintenance section
Wheelbase:
Moped-class wheelbase; exact figure not specified in this manual
Overall Length:
N/A - not specified in this manual
Seat Height:
N/A - not specified in this manual
Curb Weight:
Lightweight moped-class machine; exact figure not specified in this manual
Load Capacity:
N/A - not specified in this manual
Brakes:
Front and rear drum brakes with adjustable cable actuation
Lighting:
Headlight, taillight powered by magneto electrical system
Mirrors:
Rearview mirror(s) per model equipment
Crash Test Ratings:
N/A - mopeds of this era were not crash tested by modern agencies
Reflectors:
Reflector equipment per market regulations
Passive Features:
Minimal by modern standards; rider protective gear strongly advised in manual
Audio System:
N/A - not equipped; utilitarian moped with no audio system
Instrumentation:
Speedometer; other gauges vary by model
Lighting Controls:
Headlight and lighting switch on handlebar
Driver Assistance:
N/A - era-appropriate moped with no electronic assistance systems
Notable Technology:
Automatic centrifugal transmission and optional OilMaster oil injection were key convenience features
Scheduled Service:
Periodic maintenance schedule with mileage-based intervals provided in manual
Spark Plug:
Inspect, clean, and gap at regular intervals; replace as needed
Chain Service:
Lubricate and adjust chain tension at frequent intervals
Gear Oil:
Gearcase oil change at specified mileage interval
Carburetor:
Periodic cleaning and idle adjustment
Two-Stroke Oil:
Oil injection reservoir on Silver Bullet SP/GM; premix ratio specified for other models
Fuel:
Regular gasoline mixed with two-stroke oil where applicable
Common Wear Items:
Spark plug, brake shoes, drive chain, sprockets, tires, tubes, cables
Known Issues:
Two-stroke carbon buildup, carburetor gumming from stored fuel, and ignition point wear are typical A3 service areas
Manufacturer:
Tomos (TOvarna MOtorjev Sezana), Slovenian moped manufacturer founded in 1954
Heritage:
Tomos built licensed Puch-derived mopeds and became one of the most prolific moped makers in Europe and the US market
A3 Platform:
The A3 was Tomos's long-running automatic moped platform, sold as the Bullet and Silver Bullet in the US
Production Location:
Sezana, Yugoslavia (now Slovenia); US-market bikes assembled/distributed via Tomos USA
