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BMW R 45
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Make Model |
BMW R 45 |
|
Year |
1982-85 |
|
Engine |
Air cooled, four stroke,
two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
|
Capacity |
453 |
|
Bore x Stroke |
70 x 61.5 mm |
|
Compression Ratio |
8.2:1 |
|
Induction |
2x Bing V65 carbs |
|
Ignition /
Starting |
Bosch
contact free electronic ignition |
|
Max Power |
27 hp 20 KW @ 6500 rpm |
|
Max Torque |
37.5 Nm @ 5500 rpm |
|
Transmission /
Drive |
5 Speed / shaft |
|
Front Suspension |
Telescopic hydraulic forks. 175mm wheel
travel |
|
Rear Suspension |
Long swinging arm with adjustable strut.
110mm wheel travel |
|
Front Brakes |
2x 260mm disc 2 piston caliper. |
|
Rear Brakes |
Single 200mm drum |
|
Front Tyre |
1.85 B18 |
|
Rear Tyre |
2.50 B18 |
|
Dry-Weight |
185 kg |
|
Fuel Capacity |
22 Litres |
The R45 and R65 series, which replaced the larger and
older 500 and 6oocc models. Much neater and smaller than its predecessors,
the R45 nevertheless still weighs a hefty 4251b, the same as its larger
stablemate. Two stages of tune are offered on the R45's oversquare engine,
26bhp for the German market, where it gets into a lower insurance bracket,
and 35bhp for the rest of the world.
On the export version, peak power is
reached at 725orpm, while maximum torque is 27.51b ft attained at 55oorpm.
As is now legendary with these Berlin-built bikes, the engine is of
fiat-twin configuration with valves operated by pushrods and rockers. It may
not be the most modern layout available on a motor qycle but, over many
years, it has been improved and developed so that it is reliable, efficient and
very smooth. Performance is not a strong point of the R45 but it will reach a
top speed of just on 95mph. Fuel consumption on the other hand is excellent,
with an average figure of 55 to 6ompg being possible. The bike has a 4.8 gallon
fuel tank, so it is obvious that it was made with touring in mind.
Transmission is by five-speed gearbox and shaft drive, while braking is by a
single cross-drilled disc at the front and a powerful drum at the rear. Standard
fittings on the bike include cast-alloy wheels, audible warnings for the
indicators, twin mirrors, electric starter and a plug for fitting an intercom
device. The standard of finish is about as good as can be found on a motor
cycle, but there is a price to pay for that: the price itself, for the smallest
BMW produced was more expensive than many 750s
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