AT2M
Category: Motocross
Manufacturer: Yamaha
Hits: 659
| Year | 1972 |
| Engine Class | 125 |
| VIN Prefix | AT1 |
| Known VIN Range (Vehicle ID Numbers) | 317101 to 323520 |
| Tank Color(s) | Mandarin Orange |
| Country of Sale | USA |
| Bore (MM) | 56 |
| Stroke (MM) | 50 |
| Displacement (CC) | 123 |
| Compression Ratio (to 1) | 7.8 |
| BHP @ RPM | 20 @ 8,500 |
| Torque (kgm) @ RPM | 1.7 @ 8,000 |
| Autolube Injection? | Yes |
| Engine Cooling | Air |
| Carburetor Model | VM26SC |
| Ignition Type | Magneto |
| Ignition Timing MM (BTDC) | 2.0 |
| Primary Drive Gearing | 3.9 |
| Final Drive Gearing (Sprockets) | 45/14 |
| Box Gearing First | 2.83 |
| Box Gearing Second | 1.86 |
| Box Gearing Third | 1.37 |
| Box Gearing Fourth | 1.1 |
| Box Gearing Fifth | 96 |
| 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) | 2.75 X 21 |
| Rear Tire (stock) | 3.50 X 18 |
| Front Brake Type | Drum |
| Rear Brake Type | Drum |
| Rear Suspension | Twin Shock |
| Overall Width (mm) | 910 |
| Ground Clearance (mm) | 240 |
| Wheelbase (mm) | 1,290 |
| Dry Weight (kg) | 92 |
| Spark Plug | NGK B8ES |
| Carburetor Type | VM26SC |
| Main Jet | 190 |
| Needle Jet | N-8 |
| Jet Needle | 5F3-3 |
| Slide Cutaway | 2.5 |
| Pilot Jet | 60 |
| Air Screw (turns out) | 1.0 |
| Float Level (mm) | 25.0 |