BMW R 850 C User Manual

11.5
11
Technical data R 850 C R 1200 C
Engine, general
Engine design Four-stroke flat twin, air-cooled with oil-
cooled exhaust ports, installed longitudinal-
ly, 4 valves per cylinder, two high-mounted
camshafts, electronic fuel injection.
Location of engine number Crankcase
Cylinder bore mm (in) 87.5 (3.44) 101 (3.97)
Stroke mm (in) 70.5 (2.77) 73 (2.87)
Effective displacement cc 848 1170
Compression ratio 10.3 : 1 10.0 : 1
Power output kW (bhp)/min
-1
37 (50)/5250 45 (61)/5000
Max. torque Nm/min
-1
71/4750 98/3000
Permissible maximum engine speed min
-1
7000
Idle speed min
-1
750
+150
Direction of rotation Clockwise, looking at ignition system
Compression test pressure
good
normal
poor
bar (psi)
bar (psi)
bar (psi)
bar (psi)
above 10 (142)
8.5...10 (121...142)
below 8.5 (121)
Intake port dia./cylinder head mm (in) 45 (1.77)
Lubrication system
Theoretical volume in circulation at 6000 min
-1
Lubricating oil
Cooling oil
l (Imp. gal/
US gal)
l (Imp. gal/
US gal)
36 (7.92/9.51)
30 (6.60/7.93)
Oil filter Full-flow type
Pressure differential needed to open bypass valve bar (psi) 1.5 (21.3)
Oil pressure warning light comes on below bar (psi) 0.2...0.5 (2.8...7.1)
Pressure relief valve opens at bar (psi) 5.5 (78.3)
Operating pressure bar (psi) 3.5...6.0 (49.8...85.4)
Oil content
Without filter change
With filter change
min/max
l (Imp. pint/
US quart)
l (Imp. pint/
US quart)
l (Imp. pint/
US quart)
3.50 (6.2/3.69)
3.75 (6.6/3.96)
0.5 (0.88/0.53)
Permissible oil consumption
l/1000 km (miles per Imp. pint/miles per US quart) 1.0 (350/590)
Oil pump
Oil pump 2 Duocentric pumps
Housing depth mm (in)
mm (in)
12.02...12.05 (0.473...0.474)
10.02...10.05 (0.394...0.396)
Height of rotor mm (in)
mm (in)
11.95...11.98 (0.470...0.472)
9.95...9.98 (0.392...0.393)
Axial play mm (in) 0.04...0.1 (0.002...0.004)
Wear limit mm (in) 0.25 (0.010)

BMW R 850 C Specifications

General

Brand	BMW
Model	R 850 C
Category	Motorcycle
Language	English