JAWA 50 User Manual

www.jawamoped.com
LIGHTWEIGHT SCOOTER
JAWA 50, Types-20, 21, 23, 23 A
SPECIFICATION AND OPERATOR'S MANUAL
Cylinder capacity
49.9 c. c.
Maximum power output
3.5 HP at 6,500 r. p. m.
Manufacturers
Povazske strojarne,
Povazska Bystrica
Exporters
MOTOKOV•PRAHA•CSSR
The JAWA 50, model 20 Lightweight scooter you
have just acquired is the result of many years of
development of the well known JAWA 50, model
550, 555 and J-05 motorcycle.
The experience gained with the previous models
has been applied to the design of the scooter and
many new features introduced.
Modern design, higher engine power, improved
suspension and perfect weather protection, provide
reliable and comfortable riding as well as easy
handling.
This Manual will help you to become acquainted
with your mount and to acquire the necessary
knowledge of its components and their operation.
It will advise you on maintenance and now to
remedy minor defects. In your own interest rely on
the Manual for information; you will thus avoid
possible damage to your machine.
Accept our best wishes for many thousands of
pleasant and joyful miles with your new scooter.
Povazské strojárne,
National Corporation,
Povazská Bystrica
IMPORTANT
The right to alter the design as a result of further
development of the machine regardless of the
illustrations and description in the Manual is
reserved.
INDEX
I Technical data and riding instructions 7
1 Technical data 7
2 Running in a new machine 8
3. Riding instructions 13
4. List of tools 18
II. Maintenance 18
1. Cleaning the scooter 18
2. Lubricating the scooter 19
3. Adjusting the brakes 25
4. Tyres 26
5. Adjusting the chain 28
6. The clutch and its adjusting 29
7. The ,,JIKOV" 2917 PSb carburettor 31
8. Electrical equipment maintenance 33
9. Headlamp adjustment 34
10. Decarbonisation 35
11. Scooter maintenance table 37
III. Dismantling and assembling without
special tools 40
1. Removing the front wheel 40
2. Removing the rear wheel 40
3. Replacing the wheel ball bearings 43
4. Replacing the chain wheel ball bearing 45
5. Tipping up the seat 44
6. Dismantling and assembling the cowls 45
7. Removing and replacing cylinder barrel 46
8. Replacing the piston rings 47
9. Dismantling the headlamp 48
10. Dismantling the front fork 50
11. Pivoted rear fork 51
12. Replacing the speedometer flexible shaft51
13. Replacing the throttle cable 53
14. Replacing the clutch cable 54
15. Replacing the brake cable 55
16. Removing the engine from the frame 55
IV. Jawa 50 — type 21, Sports 59
V. Jawa 50 — types 23 and 23A Mustang 61
VI. Detects, causes and remedies 63
1 of 18 JAWA 50 type 20,21,23,23A owners handbook pages 1 to 5 jkw

JAWA 50 Specifications

General

Brand	JAWA
Model	50
Category	Scooter
Language	English

Summary

Technical Data and Riding Instructions

Technical Data

Detailed specifications of the motorcycle engine, dimensions, and performance.

Running In a New Machine

Riding Instructions

Pre-Ride Checks

Essential checks before operating the scooter, including fuel, brakes, and tyre pressure.

Starting the Engine

Step-by-step guide on how to start the scooter's engine.

Operating the Scooter

Covers starting, shifting gears, uphill riding, braking, and stopping procedures.

Maintenance

Preventing Defects

Lubricating the Scooter

Details on lubricating the engine, gearbox, and various moving parts.

Clutch and Gearbox Lubrication

Primary and Secondary Chain Servicing

Adjusting the Brakes

Steps for adjusting the mechanical brakes for optimal performance.

Lubrication Chart Details

Comprehensive chart detailing lubrication points and intervals based on mileage.

Fuel Mixture Ratios

Chain Adjustment

Adjusting Chain Tension

How to properly tension the rear drive chain for optimal performance.

Carburettor System

Jikov 2917-PSb Carburettor Details

Information on the Jikov carburettor, including jets and air screw adjustment.

Carburettor Components and Settings

Electrical System Maintenance

Lead and Sparking Plug Care

Contact Breaker and Ignition Advance

Servicing the contact breaker points and setting ignition timing.

Engine Decarbonisation

Exhaust Silencer Cleaning

Step-by-step guide to cleaning carbon deposits from the exhaust silencer.

Cylinder and Piston Carbon Removal

Methods for removing carbon buildup from the cylinder head, piston, and ports.

Scooter Maintenance Table

Regular Service Intervals

A table outlining maintenance operations and their recommended mileage intervals.

Dismantling and Assembling Without Special Tools

Front Wheel Removal and Installation

Rear Wheel Removal and Installation

Cylinder Barrel Removal and Replacement

Steps for removing and fitting the engine's cylinder barrel.

Piston Ring Replacement

Detailed guide on how to remove and install piston rings, including gap checks.

Throttle Cable Replacement

Clutch Cable Replacement

Brake Cable Replacement

Engine Removal and Installation

Procedures for detaching the engine from the frame and reinstalling it.

Troubleshooting and Remedies

Engine Performance Issues

Diagnoses and solutions for engine pinking, lumpy running, and lack of power.

Starting and Ignition Problems

Addresses issues with the engine not starting, no spark, or carburettor flooding.

Carburettor and Fuel System Faults

Compression and Mechanical Faults