BMW R45

BMW R45

The 1978 BMW R45 is a stylish and All-Rounder motorcycle with Air cooled, 473cc, Boxer, OHV and 34.94 HP (25.7 kW) @ 7250 rpm.

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Model year
1978
make icon
Make
BMW
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Engine Power
34.94 HP (25.7 kW) @ 7250 rpm
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Top Speed
99.42 mph

Technical Specifications

Engine and transmission

  • Engine type:
    2 cylinders, 4-stroke, Boxer
  • Displacement:
    473 cc (28.9 cubic inches)
  • Bore × stroke:
    2.76 inch × 2.42 inch (oversquare - shortstroke)
  • Cooling system:
    Air cooled
  • Power:
    34.94 HP (25.7 kW) @ 7250 rpm
  • Torque:
    37.5 Nm (27.66 lb-ft) @ 5500 rpm
  • Throttle:
    Cable operated
  • Valve train:
    OHV, variable
  • Valves per cylinder:
    2
  • Sparks per cylinder:
    1
  • Fuel supply system:
    Carburetor
  • Funnel diameter:
    1.1 inch
  • Compression:
    9.2:1
  • Engine mounting:
    Longitudinal
  • Lubrication system:
    Wet sump
  • Gear box:
    Manual 5-speed
  • Clutch:
    Dry, single plate, cable operated
  • Final drive:
    Shaft
  • Spark plug pipe type:
    Bosch, W 5 D
  • Starter:
    Electric

Dimensions

  • Length:
    83.1 inch
  • Width:
    27.1 inch
  • Height:
    42.5 inch
  • Wheel base:
    54.7 inch
  • Ground clearance:
    5.12 inch
  • Seat height:
    30.3 inch
  • Curb weight:
    451.9 lbs

Chassis and suspension

  • Front
    Suspension:
    Cartridge
    Suspension travel:
    6.89 inch
    Brake:
    Single Disk, Ø10.24 inch
    Tire:
    3.27 × 18
  • Rear
    Suspension:
    twin shock, Swingarm
    Suspension travel:
    4.33 inch
    Brake:
    Drum, Ø7.87 inch
    Tire:
    4.02 × 18
  • Frame type:
    steel, Double cradle frame

Other

  • ABS available:
    No
  • Power-to-weight ratio:
    0.13 KW/lbs (7.98 lbs/HP)
  • Acceleration (0-60 mph):
    7.4 sec
  • Top speed:
    99.42 mph
  • Fuel capacity:
    5.81 gals
  • Number of riders:
    2 persons
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