2012年10月8日 · 1954 BSA MC1 Claimed power: 34hp @ 10,250rpm (at gearbox sprocket) Top speed: 105mph Engine: 248.5cc air-cooled DOHC horizontal single-cylinder with bevel-gear camshaft drive, four radial valves and external flywheel, 70mm x 64.5mm bore and stroke, 10.1:1 compression ratio Weight (dry): 248lb (113kg) Fuel capacity/MPG: 7gal (26.5ltr)

Eager to develop an innovative, new generation of products for BSA, in 1949 he roughed out the concept of a 250cc single — simply coded MC1 — with a horizontal cylinder and four radial valves operated by short, chain-driven, overhead camshafts connected by bevel gears.

Engine: 248.5cc (70mm x 64.5mm) air-cooled, DOHC horizontal single cylinder with bevel gear shaft timing, four radial valves and external flywheel. Compression ratio: 10.1: 1. Lubrication: dry sump. Carburettors: Amal. Transmission: primary chain, multi …

Eager to develop an innovative, new generation of products for BSA, in 1949 he roughed out the concept of a 250cc single simply coded MC1 with a horizontal cylinder and four radial valves operated by short, chain-driven, overhead camshafts connected by bevel gears.

2022年3月26日 · Here's an early fifties BSA development project for a proposed horizontal 250 cc 4 radial valve race bike. BSA was looking for a forward thinking design to carry on the success of the Gold Star. The original concept came from Bert Hopwood in 1949, Doug Hele did much of the following development.

2012年2月8日 · Simply coded MC1, BSA's prototype 250cc racer of the early Fifties bristleswith progressive technical features. Its engine has a near-horizontal single cylinder with twin carburettors and four radial valves operated by two bevel-driven overhead camshafts. The whole machine is low-slung and extremely compact, even with a huge seven-gollon fuel tank.

BSA 250cc MC1 1954 Designed by Bert Hopwood, previously of Norton, the project began in 1950 as a four valve OHC machine destined for the road. Only one prototype was constructed which performed remarkably well, achieving a lap of 167 km/h unfaired.

Engine: 250cc air-cooled single-cylinder four-stroke. Power Rating: 35 hp @ 8500 rpm. Valves: twin shaft-driven semi-overhead camshafts/4 radial valves. Fuel System; two vertical carburetors. Transmission: 5-speed. Suspension: leading link (from); cantilever swinging forks with horizontal damper (rear) Brakes: drum (from & rear) Wheels: wire.

2023年9月29日 · That was the BSA MC1 250cc single-cylinder racer that was created in the early 1950s by the world’s largest motorcycle manufacturer of the day. The MC1 was conceived by Bert Hopwood who in the immediate post-WW2 era worked as an engineer at Norton.

Simply coded MC1, BSA's prototype 250cc racer of the early Fifties bristleswith progressive technical features. Its engine has a near-horizontal single cylinder with twin carburettors and four radial valves operated by two bevel-driven overhead camshafts. The whole machine is low-slung and extremely compact, even with a huge seven-gollon fuel tank.