1981 Yamaha IT250 Specifications and Specs
Specifications and workshop reference information for the 1981 Yamaha IT250, including engine, chassis, service data and setup details.
Note: Specs are compiled from factory data, manuals and owner feedback. Bikes vary — if yours is different, jump into the forum and share it.
General Specifications
| Engine Type | Air-cooled, 2-stroke, single-cylinder |
| Displacement | 246 cc |
| Bore × Stroke | 70.0 × 64.0 mm |
| Compression Ratio | 6.8:1 |
| Maximum Power | Approx. 28 hp |
| Maximum Torque | |
| Carburetor | Mikuni |
| Lubrication | Premix |
| Fuel Mix Ratio | 20:1 |
| Ignition | CDI |
| Spark Plug | NGK B8ES |
| Spark Plug Gap | 0.6–0.7 mm |
Transmission
| Transmission Type | 6-speed manual |
| Clutch | Wet multi-plate |
| Primary Reduction | |
| Final Reduction | Chain drive |
| Overall Reduction | |
Dimensions
| Overall Length | 2,140 mm |
| Overall Width | 840 mm |
| Overall Height | 1,160 mm |
| Wheelbase | 1,440 mm |
| Ground Clearance | 300 mm |
| Fuel Tank Capacity | 9.5 L |
Chassis
| Frame Type | Steel single cradle |
| Caster Angle | |
| Trail | |
| Front Suspension | Telescopic forks |
| Rear Suspension | Monoshock (Monocross) |
| Front Suspension Travel | |
| Rear Suspension Travel | |
Brakes & Wheels
| Front Tire | 3.00-21 |
| Rear Tire | 4.50-18 |
| Front Brake | Drum brake |
| Rear Brake | Drum brake |
250cc Other Specs
Community
VMX Owners Forum
Discuss vintage motocross bikes, restorations, tuning and riding.
