BMW R 65 GS
restricted
unrestricted
R80G/S
 
 
Engine
Motor Type
4 stroke, 2 cylinder, horizontally opposed "Boxer" engine, aircooled
Bore x Stroke
82 x 61,5 mm
84,8 x 70,6 mm
Cubic Capacity
649,6 cm3
797,5 cm3
Cylinder heads
R45?
R65
R75/5, R80
Pistons
81,96mm E=8,4
81,96mm E=8,7
84,76mm
Exhaust valves
32mm
36mm
38mm
Inlet valves
34mm
40mm
42mm
Max Power
27HP (20KW) at 5500rpm
48HP (35KW) at 7200rpm
50HP (37KW) at 6,500rpm
Max Torque
43Nm at 3500 rpm
52Nm at 5300rpm
56,7 Nm at 5,000rpm
Compression Ratio
8,4 : 1
9,2 : 1
8,2 : 1
Valves per cylinder
2
Valve control
ohv, using push rod and rocker arm
Camshaft
256 degrees
308 degrees
308 degrees
Carburation system
2 constant depression carburettors, Bing V 64
26mm 317-318
32mm 359-360
32mm 349-350
Main jet
102
130
135
Engine lubrication
wet sump
 
 
Power transmission
Clutch
dry single plate, with lever-action diaphragm spring
Number of gears
5
Gear Selection
dog-type gearbox (ratchet foot lever)
Gear ratios
4,4 / 2,86 / 2,07 / 1,67 / 1,50 :1
Rear wheel ratio
1 : 3,44
1 : 3,36
1 : 3,36
Bevel / Crownwheel
9 : 31 teeth
11 : 37 teeth
11 : 37 teeth
 
 
Electrical system
Ignition
Contact-free electronic ignition (Bosch)
Alternator
Bosch 280 W
Starter
Bosch 0.7 kW
Sparkplugs
Bosch W7DC, Beru 14-7DU, Champion N9YC, NGK BP(R)6ES
Alternative Sparkplugs
NGK Iridium BPR6EIX, BP6EY, Denso Iridium IW20, Splitfire SF6D
 
 
Chassis
Type of frame
double-loop tubular frame with bolt-on rear section
Front suspension
telescopic fork with hydraulic shock absorber
Rear suspension
BMW Monolever swinging arm
Spring travel front / rear
200 / 170 mm
Rim front
1.85 B 21
Rim rear
2.15 B 18
Tyres front
3.00-21 48 R
Tyres rear
4.00-18 64 R
Brakes front
single disc brake 260 mm dia
Brakes rear
simplex drum brake 200 mm dia
 
 
Dimensions / weights
Lengt x Width x Height
2230 x 820 x 1150 mm
Wheel base
1465 mm
Tank capacity
19,5 ltr
Weight empty
186kg
Unladen weight, full tank
198kg
Max permissible weight
398kg
Ground clearance
218mm
175mm
Fuel consumption
5,0 L / 100km (at 90km/h)
5,0 L / 100km (at 90km/h)
Top speed
146km/h
165km/h
168km/h
Acceleration 0-100km/h
9,4 sec
7,1 sec
5,6 sec
 

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