1990 Yamaha YZ250 Specifications and Specs
Specifications and workshop reference information for the 1990 Yamaha YZ250, 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 | Liquid-cooled 2-stroke single-cylinder reed valve |
| Displacement | 249 cc |
| Bore × Stroke | 68.0 × 68.0 mm |
| Compression Ratio | 7.8:1 |
| Maximum Power | |
| Maximum Torque | |
| Carburetor | Mikuni TM38SS | Replacement Options |
| Lubrication | Premix |
| Fuel Mix Ratio | 32:1 | Premix Calculator |
| Ignition | CDI |
| Spark Plug | NGK BR8EG |
| Spark Plug Gap | 0.7 - 0.8 mm |
Transmission
| Transmission Type | 5-speed constant mesh |
| Clutch | Wet multi-plate |
| Primary Reduction | 3.000 |
| Final Reduction | Chain drive |
Dimensions
| Overall Length | 2175 mm |
| Overall Width | 825 mm |
| Overall Height | 1280 mm |
| Wheelbase | 1490 mm |
| Ground Clearance | 350 mm |
| Fuel Tank Capacity | 8.5 L |
| Bearing Sizes |
Bearing Finder |
Chassis
| Frame Type | Steel perimeter frame |
| Caster Angle | 27.8° |
| Front Suspension | KYB cartridge forks | Fork Oil Levels |
| Rear Suspension | Monocross single shock |
| Front Suspension Travel | 300 mm |
| Rear Suspension Travel | 300 mm |
Brakes & Wheels
250cc Other Specs
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