Veb Mz etz 125 User manual

Index

Dear friend of MZ,

these Operating Instructions are intended for you as a help to ensure that your motor-cycle will always be your reliable companion. Due to our

experiences gathered in many years of motor cycle construction, the ETZ machine is a sturdy, highly efficient, reliable ehicle that requires but little

maintenance. In order that this will remain so for e er, we ask you to obser e the following information regarding care and treatment of your motor-

cycle.

"Bon oyage"!

VEB Motorradwerk Zschopau

Betrieb des IFA-Kombinates Zweiradfahr euge

Table of Contents

1. Technical Data

1.1. Engine and Power Transmission

1.2. Carburetter

1.3. Cycle Parts

1.4. Electrical Equipment

Bedienungsanleitung für MZ-Motorrad ETZ 125 und ETZ 150 (englisch)

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1.5. Masses

1.6. Capacities

1.7. Road Performances

2. Fuel, Lubricants etc.

3. Operation

3.1. Controls

3.2. Starting and Dri ing

3.3. Information for Running-in

4. Maintenance

4.1. General Instructions

4.2. Maintenance Chart

4.3. Lubrication Points

4.4. Gearbox Lubrication

4.5. Clutch and Brakes

4.6. Fuel Feed, Carburetter, Induction System

4.7. Wheels and Tyres

4.8. Rear Wheel Dri e

4.9. Electrical Equipment

4.10. Information about Winter Operation

5. Faults and Their Remedies

6. After-sales Service

7. For Making the Motor-cycles Complete

8. Fresh-oil Dosing Device

Wiring diagram (fold-out plate)

1. Technical Data

1.1. Engine and Power Transmission

nächster Punkt ; Index

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ETZ 125 ETZ 150 ETZ 150

Type of engine EM 125 EM 150.2 EM 150

Cycle two-stroke reser e sca enging

Output 7.5 kW at 6,000 rpm 9 kW at 6,000 rpm 10.5 kW at 6,500 rpm

Maximum torque 12.3 Nm at 5,500 rpm 15 Nm at 5,500 rpm 15.8 Nm at 6,200 rpm

Lubrication petroil lubrication 50:1

Gearbox

Number of speeds 5 5 5

Idling tell-tale light yellow tell-tale lamp - only for de luxe model

Power transmission to rear wheel

Roller chain 0,8 B-1-128 TGL 11796 (12.7 x 7.75 x 128)

Transmission gearbox - rear wheel 3.2

(15:48 teeth)

3.0

(16:48 teeth)

3.2

(15:48 teeth)

1.2. Carburetter

nächster Punkt ; Index

ETZ 125 ETZ 150 ETZ 150

Type 22 N 2-2 24 N 2-2 24 N 2-2

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Suction pipe diameter 22 mm 24 mm 24 mm

Main jet 100 120 120

Needle jet 70 2) 70 2) 70 2)

Partial load needle 2,5 A 513 2,5 A 513 2,5 A 513

Partial load needle position

from top 3 1) (2 after running-in) 3 1) (2 after running-in) 3 1) (2 after running-in)

Starting jet 70 70 70

Idling jet 40 40 40

Idle air adjusting screw for about 1.5 re olutions open, but adjustment of the maximum concentration of CO in exhaust gas to 2.5 to 3.5 per cent

by olume at 1,200 rpm

1) Pay attention to the sparking-plug appearance!

The lower plate of the needle holder counts!

2) with 2 compensator tack-type jets 60

1.3. Cycle Parts

nächster Punkt ; Index

ETZ 125 ETZ 150 ETZ 150

Springing

front telescopic fork with hydraulic damping, spring deflection 185 mm

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rear suspension units with hydraulic damping, spring deflection 105 mm, spring pre-load and setting angle adjustable

Wheels wire spokes

Rims

front 1.60 x 18 1.60 x 18 1.60 x 18

rear 1.85Bx16 1.85Bx16 1.85Bx16

Tyres

front 2.75 x 18 2.75 x 18 2.75 x 18

rear 3.25 x 16 3.25 x 16 3.25 x 16

Tyre inflation pressure (gauge pressure)

Solo

front 150 kPa (1.5 kp/cm)

rear 190 kPa (1.9 kp/cm)

with permissible total mass

front 150 kPa (1.5 kp/cm)

rear 270 kPa (2.7 kp/cm)

Brakes

front Simplex internal expanding shoe brake or

hydraulically actuated disk brake

rear Simplex internal expanding shoe brake

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1.4. Electrical Equipment

nächster Punkt ; Index

ETZ 125 ETZ 150 ETZ 150

Rated oltage 12 V 12 V 12 V

Ignition 2.5 +0.5 mm (22°45' to 23°45') before top dead centre,

Ignition timing in ariable

battery ignition

Contact-breaker gap 0.3 +0.1 mm (closing angle 132° + 5° in idling)

Sparking-plug Isolator ZM 14-260 or comparable foreign types (multi range plugs)

Electrode gap 0.6 mm 0.6 mm 0.6 mm

Three-phase current dynamo three-phase current 14 V, 15 A with rectifier and regulator

Battery 12 V, 5.5 Ah 12 V, 5.5 Ah 12 V, 5.5 Ah

Electric bulbs

headlamp 12 V, 45/40 W, TGL 11413, or H 4, passing beam asymmetric

parking light 12 V, 4 W, cap BA 9 s, TGL 10833

tail light 12 V, 5 W, cap BA 15 s

stop light 12 V, 21 W, cap BA 15 s

flashing light 12 V, 21 W, cap BA 15 s

control lamps and instrument lighting 12 V, 2 W, cap BA 7 s, TGL 10833

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Fuses

main fuse 2 x fuse link A 16 TGL 11135 (16 A)

flashing-light direction indicator system fuse link A 4 TGL 11135 (4 A)

dynamo excitation fuse link T 2 A (miniature fuse 2 A)

1.5. Masses

nächster Punkt ; Index

ETZ 125 ETZ 150 ETZ 150

Empty mass (with fuel and tools)

118 kg 1)

120 kg 2)118 kg 1)

120 kg 2)

118 kg 1)

120 kg 2)

Permissible total mass 290 kg 290 kg 290 kg

1) Variant with drum brake

2) Variant with disk brake

1.6. Capacities

nächster Punkt ; Index

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ETZ 125 ETZ 150 ETZ 150

Fuel tank 13 l 13 l 13 l

including reser e of 1.5 l 1.5 l 1.5 l

Gear oil 0.5 l 0.5 l 0.5 l

1.7. Road Performances

nächster Punkt ; Index

ETZ 125 ETZ 150 ETZ 150.1

Maximum speed 100 km/h 105 km/h 110 km/h

depending an load, atmospheric conditions and sitting position

Fuel consumption 2.3 to 3.5 l/100 km 2.4 to 3.6 l/100 km 2.6 to 4.0 l/100 km

2. Fuel, Lubricants etc.

nächster Punkt ; Index

Engine

Petrol ha ing an octane rating of 88 (ROZ) which is mixed with two-stroke engine oil in the ratio of 50:1.

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Example: 10 l fuel to be mixed with 0.2 l of two-stroke engine oil.

Gearbox

Gear oil SAE 80 or non-additi e type of engine oil SAE 40 for summer and winter. In the GDR, oil of grade GL 100 is used.

Cycle parts

Gear oil SAE 80 and antifriction bearing grease.

Electrical equipment

For a new battery use accumulator sulphuric acid ha ing a density of 1.28 g/cm3 (in the tropics 1.23 g/cm3) at 25 °C. For topping up the battery, only

use distilled water. Use grease battery terminals for protection against corrosion of the battery connections.

Use hypoid oil (gear oil of a high degree of iscosity) for the contact-breaker lubricating felt pad.

3. Operation

3.1. Controls

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nächster Punkt ; Index

Figs. 1 to 9 show all control elements required for operating the motor-cycle and their functions. Please, familiarise yourself with them throughly before

the first start.

Fig. 1. Controls of the motor-cycle

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(1) Ignition and light switch

(2) Clutch le er

(3) Combined switches for electrical system

(4) Gearchange pedal

(5) Fuel shut-off cock

(6) Kick-Starter

(7) Prop stand

(8) Hand brake le er

(9) Le er for cold-starting de ice

(10) Throttle twist-grip

(11) Brake pedal

(12) Pillionist's foot rests

Fig. 2. Instruments (standard design)

(1) Ignition and light switch (switch positions as shown in Fig. 3)

(2) Speedometer with kilometer counter

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(3) High-beam headlight indicator (blue)

(4) Tell-tale light for dynamo and flashing-light direction indicator system (green)

Fig. 3. Instruments (deluxe model)

(0) All loads switched off - key (9) can be withdrawn

(1) Parking position at night - key can be withdrawn, town light switched on

(2) Ignition switched on, riding in the daytime - key cannot be withdrawn - pushing the motor-cycle for starting without battery is possible with the 2nd gear

in engagement

(3) Ignition switched on, parking and tail lamps burn - key cannot be withdrawn

(4) Ignition switched on, night operation - key cannot be withdrawn

(5) Re olution counter

(6) Idling indicator (yellow)

(7) Control light for dynamo (red)

(8) Ignition and light switch

(9) Ignition key

(10) High-beam headlight indicator (blue)

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(11) Tell-tale light for flashing-light direction indicator system (green)

(12) Speedometer with kilometer counter

Fig. 4. Combined switches at handle-bars

(1) Dimmer switches for headlamp

high-beam headlight

passing beam

(2) Switch for direction indication

(L) left-hand flashing-light indicator

(R) right-hand flashing-light indicator

(3) Push-button for horn

(4) Push-button for by-pass light signal

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Fig. 5. Throttle twist-grip and cold-starting de ice

(1) Cold-starting de ice closed

(2) Cold-starting de ice switched on

(Z) Throttle twist-grip closed

(A) Throttle twist-grip open (full throttle)

(B) Friction brake throttle twist-grip - adjusting screw

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Fig. 6. Fuel shut-off cock

(1) Fuel shut-off cock closed

(2) Fuel shut-off cock open

(3) Reser e position

(F1)Inlet filter

(F2)Outlet filter

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Fig. 7. Gearchange pedal

Numbers: position of the gears

(F) Gearchange pedal

(K) Kick-starter

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Fig. 8. Theft pre ention (at the right in Fig. 8. Special ersion for export)

(1) Sense of rotation for unlatching the look

(2) Sense of rotation for latching the look

The theft pre ention de ice has to be locked after unlatching by shifting the lock upwards (to the interior in the export design).

Fig. 9. Changing the pre-load on the spring

(1) Setting for single-person operation

(2) Setting for higher loads

(3) Fastening point for 'soft' springing

(4) Fastening point for 'harder' springing

3.2. Starting and Driving

nächster Punkt ; Index

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Before any ride, check the ehicle for reliability of operation and roadworthiness according to the Maintenance Chart (see Section 4.2.).

Starting

Shift the gearbox to neutral position (Fig. 7).1.

Switch an the ignition system (Fig. 3).

Control light for dynamo will light.

Control light for idling will light (de luxe model).

Open the fuel shut-off cock (Fig. 6).3.

With the engine in a cold state: Open the cold-starting de ice (Fig. 5).

With the engine in a hot state: Lea e the cold-starting de ice in the closed position.

With the engine in a cold state: Throttle-twist grip is in the neutral position.

With the engine in a hot state: Open the throttle-twist grip for about one quarter of a re olution.

Vigorously actuate the kick-starter.6.

Close the cold-starting de ice when the engine readily accepts gas.7.

Notice! In the case of extremely low ambient temperatures, and when the engine has been subjected to se eral starting trials in ain, allow the engine to

rest for 20s in order that fuel in the cold-starting de ice can be restored to normal le el.

Driving

The temperature of the engine need not be raised when the ehicle is stationary, it rises during road operation. Actuate the clutch le er and shift gears,

starting with the first gear in engagement. The operating ranges of the arious gears are shown in Figs. 10 and 11.

Notice!

Only use the clutch for mo ing off and for shifting gears. When stopping for a prolonged period of time, shift to the neutral.

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Fig. 10. Engine speed and tra el speed ranges of ETZ 125

Maximum engine speed and tra el speed during the running-in period

Main operating ranges (engine speed and tra el speed) after the running-in period

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Fig. 11. Engine speed and tra el speed ranges of ETZ 150

Maximum engine speed and tra el speed during the running-in period

Main operating ranges (engine speed and tra el speed) after the running-in period

The extension of the ranges shown in black applies to the ETZ 150 with an output of 10.5 kW

Braking

Always use both brakes, applying them in accordance with the gi en situation. Blocking brakes extend the braking distance and impair roadholding of

the ehicle.

Parking

Switch off the ignition system, withdraw the ignition key. Close the fuel shut-off cock, turn the handle-bars to the right and block the steering system by