Zündapp ZS 25

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Zündapp ZS 25

The Zündapp ZS 25 is a moped from Zündapp . It was built from 1981 to 1984 and, in contrast to the two-speed models ZL and ZX, has a three-speed gearbox that is shifted manually using a twist grip on the left side of the handlebar. It was delivered with a single seat bench.

Zündapp ZS 25

Years of construction

Type 460-050: 1981-1982

Type 460-051: 1983-1985

Technical specifications

engine

Type: 278-180

Design: single-cylinder two-stroke engine, interlocked with gearbox

Displacement: 49.9 cm³

Bore: 39 mm

Stroke: 41.8 mm

Compression: 8.4: 1

Maximum power: 1 kW

maximum torque: 3.75 Nm

Cooling: wind-cooled

Mixture: 1:50

Carburetor

Type: Mikuni SE VM 13-83

Main jet: 62.5

Needle nozzle: E-8

Nozzle needle: 3 J 2

Needle position: 4

Idle jet: 40

Idle propeller: 1 1/4 open

Slider: 2.0

Start jet: 35

Air nozzle: 0.6

Electrical system

Type: Bosch magneto generator

Power generator: 6 V / 19-5 / 10 W.

Spark plug: Bosch W 8 D, heat value 145

Electrode gap: 0.4 mm

Ignition timing: 0.9 mm + 0.2 mm

Headlight lamp: 6 V / 15 W (permanently dimmed)

Taillight lamp: 6 V / 4 W.

Brake light bulb: 6 V / 10 W.

Speedometer lighting: 6 V / 1.2 W.

transmission

Design: Gear drive with draw-wedge switching

Number of gears: 3

Shifting: twist grip manual shift

Primary drive: spur gears

Gear ratio engine / gearbox: 4.33 (78: 18 teeth)

Secondary drive / roller chain: 1/2 X 3/16; 108 links

Gear ratio in the gearbox:

1st gear: 2.47

2nd gear: 1.48

3rd gear: 1.08

Clutch: multi-plate oil bath clutch

Gear / rear wheel ratio: 4.09 (45: 11 teeth)

chassis

Design: central tube frame

Front suspension: telescopic fork with compression spring

Rear suspension: long swing arm with struts

Rim dimension: 1.60 X 17 "

Tires: 2 1 / 2-17 "moped

Front air pressure: 1.8 bar overpressure

Rear air pressure: 2.5 bar overpressure

Front and rear brakes: inner-shoe drum brakes with a drum diameter of 120 mm

Number of seats: 1

Fuel tank content: 6.5 liters (including 1.0 liter reserve)

Weight, dimensions, consumption, speed

Empty weight: 62 kg

Permissible total weight: 180 kg

Wheelbase: 1150 mm

Length: 1750 mm

Width: 640 mm

Height: 1010 mm

Seat height: approx. 780 mm

Fuel consumption: approx. 1.7 l / 100 km

Top speed: 25 km / h

Mountaineering ability in 1st gear: 40%