.

BMW R 61

Make Model

BMW R 61

Year

1938 - 41

Engine

Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.

Capacity

600 cc / 36.6 cu in.
Bore x Stroke 70 x 78 mm
Compression Ratio

5.7:1

Cooling System Air cooled

Induction

1x Amal M75/426 S carburetor

Ignition

Battery ignition

Starting

Kick

Clutch Single plate, dry

Max Power

13.4 kW / 18 hp @ 4800 rpm

Transmission  /  Drive

4 Speed
Gear Ratio 1st 3.6 / 2nd 2.28 / 3rd 1. 7 / 4th 1.3:1
Frame Twin loop steel tubular frame

Front Suspension

Telescopic fork

Rear Suspension

Telescopic suspension

Front Brakes

∅200mm Drum

Rear Brakes

External shoe brake at the gearing on Cardan shaft

Front Tyre

3.00 -19"

Rear Tyre

3.50 -19"

Wet-Weight

184 kg / 405 lbs

Fuel Capacity 

14 liters / 3.6 US gal