1977 Harley-Davidson MX250 Specifications and Specs
Specifications and workshop reference information for the 1977 Harley-Davidson MX250, 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.
ENGINE
| Engine Type | Air-cooled two-stroke single-cylinder |
| Displacement | 242 cc |
| Compression Ratio | 11.8:1 |
| Maximum Power | Approximately 32 hp at 9,000 rpm |
| Carburetor | 38 mm Dell'Orto | Replacement Options |
| Induction | Five-port cylinder with bridged intake |
| Cylinder Bore | Chrome plated |
| Ignition | CDI, Dansi or Motoplat depending on production fitment |
| Fuel System | Premix two-stroke lubrication | Premix Calculator |
TRANSMISSION
| Transmission | 5-speed close-ratio |
| Clutch | Multi-plate wet clutch |
| Primary Drive | Straight-cut gears |
| Final Drive | Chain |
CHASSIS
| Frame | Chrome-moly steel double-downtube frame |
| Steering Rake | 30 degrees |
| Wheelbase | 58 in (1,473 mm) |
| Seat Height | 34.2 in (869 mm) |
| Weight | Approximately 253 lb (115 kg) |
SUSPENSION
| Front Suspension | 36 mm Kayaba leading-axle telescopic forks | Fork Oil Levels |
| Front Wheel Travel | 9 in (229 mm) |
| Rear Suspension | Twin Kayaba remote-reservoir shock absorbers | Rear Suspension Setup |
| Rear Wheel Travel | 9 in (229 mm) |
WHEELS & TYRES
| Front Rim | 21 in Akront aluminium rim |
| Rear Rim | 18 in Akront aluminium rim |
| Front Tyre | 3.00-21 | Tyre Size Guide |
| Rear Tyre | 4.60-18 | Tyre Size Guide |
| Wheel Hubs | Leleu |
BRAKES
| Front Brake | Drum |
| Rear Brake | Drum |
250cc Other Specs
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