| Model |
BMW
R42 - Engine Designation was M43 |
| Engine
Type |
Flat
Twin Cylinder, side valve air cooled. Numbers
40001-46999 |
| Years
in Production |
1926
- 1928 |
| Number
Sold |
6900
or 6998 depending on reference |
| Followed
on from |
In
part from the R39 250 |
| Capacity |
494
cc |
| Bore
x Stroke |
|
| Power
@ RPM |
12
ps |
| Top
Speed |
95
km/hour |
| Compression |
4.9
: 1 |
| Fuel
System |
14
litres |
| Oil
and Lubrication |
Gearbox
remained grease lubricated, while final drive
changed to oil |
| Gears
& Ratios |
3.
Rear drive was 1:3.8 for the solo, and !:5.7
for the sidecar model |
| Clutch |
|
| Drive
& Ratios |
|
| Electrical
System |
Magneto,
lights were an option |
| Frame
Type |
Rigid |
| Front
Suspension |
|
| Rear
Suspension |
|
| Front
Brakes |
Front
drums single shoe leading |
| Rear
Brakes |
Copied
from the R39, no wooden block, now outside
band on drum. |
| Rims |
|
| Front
Tyre |
|
| Rear
Tyre |
|
| Size
LxWxH |
|
| Wheel
Base |
|
| Tank
Size |
14
litres |
| Fuel
Consumption |
3
litres per 100 kms |
| Oil
Consumption |
|
| Weight
with Fuel |
126
kg |
| Maximum
Loading |
|
| Colours |
Black |
| Famous
Riders |
|
| Other
Notes |
Kick
starter remained "fore and aft".
Speedo cable comes from a small gear at the
front of the gearbox. |
| Links
for Model |
Built
as the original touring machine for the masses,
it came fitted with sidecar mounts, and originally
with a wooden block brake, rapidly replaced
with that listed above. |
| |
|
| |
|
