Bridgestone 90 - Motorcycle Specifications; BS 50 Sport Specifications

Classic Cycles Technical Resources
1
SPECIFICATIONS
BS 50 Sport BS 60 Sport
'Engine:
(1) Type: 2-stroke, Single Cyl. 2-stroke, Single Cyl.
(2) Piston Displacement: 50cc.(3.15cu.in.) 58cc.(3.54cu.in.)
(3) Bore & Stroke 39 mm x 42 mm (1.53 x 1.65 in.) 42 mm x 42 mm (1.65 x 1.65)
(4) Compression Ratio: 6.60:1 6.70:1
(5) Max. Brake H.P. 5.2 HP/8500 rpm. 5.6 HP/8500 rpm.
(6) Max. Torque: 0.45 kg-m/7500 rpm. 0.48 kg-m/7500 rpm.
(7) Air Intake System: Rotary Disc Valve Rotary Disc Valve
(8) Starting System: Kick Starter Kick Starter
(9) Charging System: A.C. Magneto A.C. Magneto
(10) Ignition System: Flywheel Magneto Flywheel Magneto
(11) Ignition Timing: 19° before T.D.C. 19° before T.D.C.
(12) Spark Plug: N.G.K. B-7 N.G.K.. B-8
(13) Carburetor: AMAL Type, VW15SC. AMAL Type, VW15SC.
(14) Fuel Mixture: 20 to 1 (gasoline) 20 to 1 (gasoline)
(motor oil SAE No. 30) (motor oil SAE No. 30)
(15) Transmission Oil: 0.132 gal. in trans. 0.132 gal. in trans.
case; SAE #20 (winter) case; SAE #20 (winter)
or SAE 10W30 (all season) or SAE 10W30 (all season)
* Performance:
(1) Max. Speed: 85 km/h (53 mph) 88 km/h (55 mph)
(2) Climbing Ability: 1 in 3.5 1 in 3.5
(3) Fuel Consumption: 200mpg/20mph at 30km/h 176mpg/20mph at 30km/h
paved level test road paved level test road
(4) Min. Turning Radius: 1.8m (70.8 inch) 1.8m (70.8 inch)
(5) Acceleration: 14.5 sec. (Stan. st. 0-200 m) 14.0 sec. (Stan. st. 0-200 m)
(6) Braking Distance: Less than 8 m at 35 km/h Less than 8 m at 35 km/h
(26 feet, at 22 mph) (26 feet, at 22 mph)
'Frame & Suspension:
(1) Frame Type: Pressed Steel/Backbone Pressed Steel/Backbone
(2) Front Suspension: Telescopic Fork with Telescopic Fork with
Hydraulic Damper Hydraulic Damper,