Start of Production

1985

 

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End of Production

1988

Numbers Produced

?

Price

?

Engine

 

Motor Type

Four-stroke two cylinder horizontally opposed "Boxer" engine, air cooled

Bore x Stroke

82 x 61.5 mm (3.22 x 2.42 in)

Displacement

649.6 cc

Max Power

48 hp (35 KW) at 7,250 rpm or 27 hp (20 Kw) at 5500 rpm

Max Torque

47.8 Nm / 35 ft lb at 3,500 rpm or 45.5 Nm / 33 ft lb at 3,500 rpm

Compression Ratio

8.7 : 1 or 8.4 : 1

Valves Per Cylinder

2

Valve Control

OHV, using push rod and rocker arm

Carburation System

2 constant depression carburettors, Bing  64/32/359 -  64/32/360 or 64/26/317 - 64/26/318

Engine Lubricating System

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)

Gearbox Ratios

4.4 / 2.86 / 2.07 / 1.67 / 1.50

Rear Wheel Ratio

?

Bevel/Crownwheel

?



Electrical System

 

Ignition System

Contact free electronic ignition (Bosch)

Alternator

Bosch 280 W

Starter

Bosch 0.7 Kw

Spark Plugs

Bosch W 7 DC / Beru 14-7 DU/ Champion N9YC






Chassis

 

Type of Frame

Double loop tubular frame with bolt on rear section

Front wheel suspension

Telescopic fork with hydraulic shock absorber

Rear wheel suspension

BMW Monolever swinging arm

Spring Travel Front/Rear

175 / 121 mm (6.88 / 4.76 in)

Wheel Rims, Front

MTH 2.50 x 18 E

Wheel Rims, Rear

MTH 2.50 x 18 E

Tyres, Front

90 / 90 18 51 H or 90 / 90 18 51 S

Tyres, Rear

120 / 90 18 65 H or 120 / 90 18 65 S

Brakes, Front

Single disc brake 285 mm / 11.22 in diameter. Brembo 2 piston caliper ?

Brakes, Rear

Simplex drum brake 200 mm / 7.87 in diameter




Dimensions/Weights

 

Length x Width x Height

2175 x 960 x 1478 mm (85.62 x 37.79 x 58.18 in)

Wheel Base

1447 mm / 56.96 in

Fuel Tank Capacity

22 litres / 4.83 gal / 5.81 gal US

Unladen Weight with Full Tank

?

Max. Permissible Weight

440 Kg / 969 lb

Ground Clearance

140 mm / 5.51 in

Seat Height (Unladen)

807 mm (31.8 inches)

Fuel Consumption

?

Top Speed

?

Acceleration 0 - 100 Kph / 62 mph

?



Information kindly supplied by P.Hawksley

www.bmbikes.co.uk