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BT 50 engine data sheet

Engine versions: 3/4/5-speed

Additional equipment: pedals

Basic technical specifications

Engine: single cylinder, two stroke, air cooled

Bore x stroke: 38 x 43 mm

Piston displacement: 49 cc

Compression ratio: 11:1

Power output: 4.0 kW/8000 min-1

Torque: 5.0 Nm/7500 min-1

Weight: 14.8 kg

Carburetor: Bing 18

Gearbox: primary involute transmission, secondary 5-speed manual shift

Gearbox oil/quantity: SAE 10 W 30/400 cc

Transmission ratios:
Primary gear ratio i = 4.07
Gear ratio 1 st speed i = 4.33
Gear ratio 2 nd speed i = 2.28
Gear ratio 3 rd speed i = 1.59
Gear ratio 4 th speed i = 1.24
Gear ratio 5 th speed i = 1.07
Chain sprocket n = 10

Ignition: electronic 12V/80W

Mixture: gasoline and two stroke oil (4%)

Starting: kick starter


Power-Torque curve