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BMW R 45

Make Model	BMW R 45
Year	1982 -
Engine	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Capacity	453 cc / 27.6 cu in.
Bore x Stroke	70 x 61.5 mm
Compression Ratio	8.2:1
Cooling System	Air cooled
Induction	2 x Bing V65 carburetors
Ignition	Bosch contact free electronic ignition
Max Power	20 kW / 27 hp @ 6500 rpm
Max Torque	37.5 Nm 3.8 kgf-m / 27.65 lb-ft @ 5500 rpm
Transmission	5 Speed
Final Drive	Shaft
Front Suspension	Telescopic hydraulic forks
Front Wheel Travel	175 mm / 6.9"
Rear Suspension	Long swinging arm with adjustable strut
Rear Wheel travel	110 mm / 4.3"
Front Brakes	2 x 260mm Discs, 2 piston caliper.
Rear Brakes	Single 200mm drum
Front Tyre	1.85 - B18
Rear Tyre	2.50 - B18
Dry Weight	185 kg / 408 lbs
Fuel Capacity	22 Litres / 5.8 US gal

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