1979 Yamaha YZ250 Specifications and Specs
Specifications and workshop reference information for the 1979 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.
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General Specifications
Engine Type Air-cooled 2-stroke single-cylinder reed valve Displacement 246 cc Bore × Stroke 70.0 × 64.0 mm Compression Ratio 6.8:1 Maximum Power Maximum Torque Carburetor Mikuni VM38SS | Replacement Options Lubrication Premix Fuel Mix Ratio 20:1 | Premix Calculator Ignition CDI Magneto Spark Plug NGK B8ES Spark Plug Gap 0.6 - 0.7 mm
Transmission
Transmission Type 5-speed constant mesh Clutch Wet multi-plate Primary Reduction 3.000 Final Reduction Chain drive
Dimensions
Overall Length 2170 mm Overall Width 820 mm Overall Height 1240 mm Wheelbase 1490 mm Ground Clearance 300 mm Fuel Tank Capacity 10.0 L
Bearing Sizes
Bearing Finder
Chassis
Frame Type Steel single backbone Caster Angle 28° Front Suspension Telescopic forks | Fork Oil Levels Rear Suspension Monocross single shock Front Suspension Travel 280 mm Rear Suspension Travel 295 mm
Brakes & Wheels
250cc Other Specs
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