1975 Harley-Davidson SX250 Specifications and Specs

Specifications and workshop reference information for the 1975 Harley-Davidson SX250, 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, loop-scavenged
Displacement	242.6 cc
Bore	72 mm (2.84 in)
Stroke	59.6 mm (2.35 in)
Compression Ratio	10.3:1
Cylinder	Cast aluminium with chrome-plated bore
Maximum Rear-Wheel Power	Approximately 21.4 bhp at 7,750 rpm
Carburetor	32 mm Dell'Orto PHB32AD \| Replacement Options
Lubrication	Automatic oil-injection system
Ignition	Breakerless capacitor-discharge ignition
Starting	Primary kick starter; engine can be started in gear

Frame	Steel full double-cradle frame
Wheelbase	54.2 in (1,375 mm)
Seat Height	31.5 in (800 mm)
Ground Clearance	6.9 in (175 mm)

Front Suspension	Marzocchi telescopic forks \| Fork Oil Levels
Rear Suspension	Swingarm with twin Marzocchi shock absorbers and five-position spring preload adjustment \| Rear Suspension Setup

Front Tyre	3.25-19 \| Tyre Size Guide
Rear Tyre	4.00-18 \| Tyre Size Guide
Front Tyre Pressure	22 psi
Rear Tyre Pressure	25 psi
Rear Hub	Quick-detachable ISDT-style hub

Front Brake	Drum
Rear Brake	Drum

Fuel Tank Capacity	Approximately 2.22 US gal (8.4 L)
Oil Tank	Oil-injection reservoir incorporated into the main frame tube
Ignition Operation	Ignition system operates independently of the battery

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