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1970 BSA Rocket3 A75R - Specifications

ENGINE
Type Air cooled, 3 cyl, OHV, all alloy
Capacity 741cc
Bore/Stroke 67 x 70mm
Compression Ratio 9.5 : 1
Spark Plugs Champion N3
Carburettors 3 Amal Concentric 626
TRANSMISSION
Crankshaft Single casting, forged 120 deg throws
Primary Drive Triplex chain - 7/16", 70 links
Clutch Dry, Single plate (Borg & Beck)
Gearbox 5 speed
Gear Ratios
High 4.92
3rd 6.89
2nd 9.04
Low 12.71
Sprockets
Gearbox 19 teeth
Rear Wheel 50 teeth
Final Drive Single row chain, 5/8" x 3/8", 110 links
CAPACITIES
Fuel Tank
UK & General Export 4 1/2 gallons
USA 2 1/2 gallons
Oil tank 6 US pints : 5 Brit Pints (2.8 litres)
Gearbox 1 3/4 US pints : 1 1/2 Brit pints (850cc)
Primary Chaincase 3/4 US pints : 5/8 Brit pints (350cc)
Front Forks 210cc (each leg)
ELECTRICAL
Ignition Individual points and coil per cylinder
Headlight 1 x 12v 55/45w
WHEELS
Wheels
Front

Chrome rim, spoke, 19" x WM2

Rear

Chrome rim, spoke, 19" x WM3

Tyres
Front

Dunlop TT100, 4.10 x 19

Rear

Dunlop TT100, 4.10 x 19

Suspension
Front

35mm forks

Rear

Twin Girling shocks, adjustable preload

Brakes
Front

TLS 8"drum

Rear

SLS 8"drum

DIMENSIONS
Length 88" (2235mm)
Width 29" (735mm)
Height 46.5" (1180mm)
Ground Clearance 7" (178mm)
Seat height 31 1/4" (794mm)
Wheelbase 58" (1475mm)
Weight (dry) 503lb (228kg)
PERFORMANCE
Maximum power 58bhp at 7,250rpm, at crankshaft at sea level.
Maximum torque ?
Maximum revs 8,000rpm (no redline on tachometer)
COLOURS
Red
Blue
Lime GreenBlue