AT3
Category: Enduros
Manufacturer: Yamaha
Hits: 1040
| Year | 1973 |
| Engine Class | 125 |
| VIN Prefix | AT1 |
| Known VIN Range (Vehicle ID Numbers) | 200101 to 232651 |
| Tank Color(s) | Brigade Blue |
| Country of Sale | USA |
| Bore (MM) | 56 |
| Stroke (MM) | 50 |
| Displacement (CC) | 123 |
| Compression Ratio (to 1) | 7.1 |
| BHP @ RPM | 13 @ 7,000 |
| Torque (kgm) @ RPM | 1.38 @ 6,000 |
| Autolube Injection? | Yes |
| Engine Cooling | Air |
| Carburetor Model | VM24SH |
| Ignition Type | Starter/Dynamo |
| Ignition Timing MM (BTDC) | 1.8 |
| Primary Drive Gearing | 3.9 |
| Final Drive Gearing (Sprockets) | 45/15 |
| Box Gearing First | 3.18 |
| Box Gearing Second | 2.0 |
| Box Gearing Third | 1.37 |
| Box Gearing Fourth | 1.0 |
| Box Gearing Fifth | 0.80.8 |
| Fuel Capacity (L) | 7 |
| 2 Stroke Oil Tank Capacity (L) | 1.23 |
| Gearbox Oil Capacity | 0.75 |
| Fork Oil Capacity (CC/Fork Leg) | 120 |
| Front Tire (stock) | 3.00 x 18 |
| Rear Tire (stock) | 3.25 x 18 |
| Front Brake Type | Drum |
| Rear Brake Type | Drum |
| Rear Suspension | Twin Shock |
| Overall Width (mm) | 910 |
| Ground Clearance (mm) | 240 |
| Wheelbase (mm) | 1,280 |
| Dry Weight (kg) | 100 |
| Spark Plug | NGK B9ES |
| Voltage | 12 Volt |
| Carburetor Type | VM24SH |
| Main Jet | 230 |
| Needle Jet | 0-6 |
| Jet Needle | 5J3-3 |
| Slide Cutaway | 2.5 |
| Pilot Jet | 35 |
| Air Screw (turns out) | 2 |
| Starter Jet | 40 |
| Float Level (mm) | 21.0 |