1921 2 ¾ h.p. "Calthorpe-Jap"

1921 jap

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Engine - 2 ¾ h.p. Jap, 70 mm. bore x 76 mm. stroke having a capacity of 292 c.c. 

Carburetter - Amac.

Ignition - High-tension variable Magneto, handle bar control.

Tank - 1 ¼ gallons petrol, 1 quart oil, Best & Lloyds's sight-feed lubrication.

Transmission - Enfield Patent Two-Speed gear and Free-Engine with cush sprocket. Roller chains from engine sprocket to gear. ¾in. Dunlop belt from fixed pulley off gear to rear belt rim.

Frame - Weldless steel tubing, all vital parts reinforced, Patent Girder spring forks.

Brakes - Rear acting on belt rim, operated from foot pedal and powerful Bowden front brake.

Wheels - 26in. x 2in. Dunlop Beaded Edge Studded Tyres, heavily plated steel rims with coloured centres, oil retaining dust and weather proof hubs.

Standard Fittings - Patent Pan seat, rear stand, carrier, strong wide mudguards, armoured Pannier Bags with tools.

Finished in four coats of lustre enamel and all bright parts heavily plated, tank enamelled Black and Gold leaf lined.




New "registered designed" shaped tank.

Additional Information - (Available to members in downloads section)

  • 1921 Sales Brochure, Enfield gear information and spare parts list.


  • 1921 Sales Brochure.