Technical data:
BMW single-cylinder, four-stroke engine, blower cooled
Engine:
250 c.c. engine 300 c.c. engine
Bore 68 mm (2.67 in.) 72 mm (2.83 in.)
Stroke 68 mm (2.67 in.) 73 mm
(2.87 in.)
Capacity 245 c.c. (14.83cu.) 298c.c. (18.61 cu. In.)
Compression 6.8 to 1 7 to 1
Power 12 bhp at 5,800 rpm 13 bhp at 5,200 rpm
overhead, in V-arrangement
Valve timing measured at .08 in. valve clearance:
Intake opens 6° after T.D.C.
Intake closes 34° after B.D.C.
Exhaust opens 34° before B.D.C.
Valves
Exhaust closes 6° before T.D.C.
Lubricating system force feed lubrication
Gulch Single plate dry clutch
Engine position Right hand side, transverse behind the seat
Starter 12 volt dynamo starter Noris, LA 12/130 R.
Electrical equipment 12 volt/130 watt generator with voltage regulation
Sparking plug Bosch W 240 T 1
Battery 12V 24 Ah
Carburetor:
Type Bing throttle slide carburetor with starter
1/22 250 c.c. 1/22 300 c.c.
Main jet 130 130
Needle jet 1310 / 6 1308
jet needle 2023 2023
Needle position 1 2
Idling jet 35 35
Pilot air screw opened 1 1/2 to 2 turns 1 1/2 to 2 turns
Starter jet 55 55
BMW four forward speed and reverse gearbox
Gear ratios: Overall gear ratios:
1st 10.05 23.21
2nd 5.17 12.14
3rd 3.54 8.17
4th 2.70 6.1
Transmission:
Reverse 12.15 30.0
Final drive Final drive 2.31 (13/30 teeth) through transverse re-silient
mounted drive shaft and totally enclosed, f ully
adjustable chain drive in oil bath.
Chassis frame:
Rigid tubular chassis frame
Axle layout and suspension:
Front wheels Independent front wheel suspension, swinging arms.
coil springs and shock absorbers
Camber 1 1/2 deg.
King pin inclination 5 deg., castor 2.44 in., toe-in 4 to
5 mm = .16 to .20 in., measured on the front border,
and the rear border of the rim.
Rear wheels Narrow axle with suspension by quarter elliptic leaf
springs and telescopic shock absorbers
6
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