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Aprilia TX311M

The Aprilia TX 311M was a liquid-cooled, two-stroke, single cylinder Trial motorcycle produced by Aprilia from 1984 to 1986. Claimed horsepower was 17.03 HP (12.7 KW) @ 6400 RPM.

Aprilia TX 311M
Production 1984 - 1986
Class Trial
liquid-cooled, two-stroke, single cylinder
Bore / Stroke 76.2mm x 76.2mm
Compression ratio 8.5:1
Horsepower 17.03 HP (12.7 KW) @ 6400RPM
Spark Plug NGK BP5ES
Transmission Gear box: gears

Final Drive: chain

Clutch: wet multi-disc, manual
Suspension Front: telescopic fork
Rear: monoshock
Brakes Front: single disc
Rear: drum
Front Tire 2.75-21
Rear Tire 4.00-18
Weight 85.0 kg (wet)
Manuals Service Manual



A 76.2mm bore x 76.2mm stroke result in a displacement of just 277.0 cubic centimeters.


The bike has a gears transmission. Power was moderated via the wet multi-disc, manual.


It came with a 2.75-21 front tire and a 4.00-18 rear tire. Stopping was achieved via single disc in the front and a drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a monoshock.

1986 Aprilia TX 311MEdit


The 1986 MY Aprilia TX 311M sports a liquid-cooled, two-stroke, 277cc, single cylinder powerplant paired to a six-speed manual transmission, and can produce a claimed 17 horsepower at 6400 rpm. It comes standard with large, laced wheels, a telescopic front fork, a monoshock as a rear suspension, a low seat height, a high-mounted exhaust system, a front disc brake coupled to a rear drum unit and a bold paint scheme.


Make Model Aprilia TX 311M
Year 1985
Engine Liquid cooled, single cylinder, two stroke
Capacity 277
Bore x Stroke 76 x 61 mm
Compression Ratio 8.5:1
Ignition / Starting
Max Power
Max Torque
Transmission / Drive 6 Speed / chain
Front Suspension
Rear Suspension
Front Brakes Disc
Rear Brakes Drum
Front Tyre 2.75-21
Rear Tyre 4.00-18
Fuel Capacity 6.5 kg