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15.   REPLACING THE BRAKE CABLE

To replace:
  a) When replacing the control cable complete
unscrew the bowden cable nut and take the
bowden cable off the brake cams lever.
  b) Remove the headlamp. Free the front brake
cable from the handlebar lever in the same

 

manner

as the clutch cable.
  c) Free the rear wheel brake cable with the
screwdriver slackening the screw through the

 

hole

in the L.H. floor board.
  To replace proceed in reverse manner.

16.   REMOVING THE ENGINE FROM

THE FRAME

  a) Remove the cowl (Part III, Para 6) and the

 

air

cleaner.
  b) Disconnect the fuel line, the throttle and

 

clutch

cable and the gear change pedal rod.
  c) Disconnect the chain.
  d) Unscrew the 4 M8 fastening bolts.
  e) Take out the engine.

To replace:
  A. Place the engine in the frame and tighten

 

the 4

M8 bolts.
  B. Replace the chain, the fuel line, the throttle
and clutch cable and the gear change pedal rod.
  C. Fit the cowls (Part III, Para 6).
  D. Check the running of the engine and having
ridden a short distance tighten all screws, bolts

 

and

nuts.

SEIZURE OF STARTING SEGMENT

In case of seizure of starting segment or in

 

case of

ineffective depressing the starting lever

 

to avoid

the quick wear and damaging the

 

starting

transmission the following procedure is

 

required:

 

 

1. Starting lever be returned to the former

position
  2. Be engaged the bottom gear
  3. Move the vehicle ahead by some cms (to

 

make

rotate the starting pinion)
  4. Put out the bottom gear
  5. Repeat the starting

CLUTCH COVER FALLS OUT

Falling out the clutch bowden cover is caused

 

by

incorrect assembly and dismantling and
simultaneously also the tear of catch nose takes
place. To eliminate the failure the following
procedure is required:

When dismantling according to the fig. no, a

  1. By means of screwdriver put out the cover
from one groove
  2. The cover remove from the R. H. cover.

When assembly according to the figure no. b

  1. The cover is to be put into one groove and

 

to

be flush with R. H. cover face.
 

 

2. The cover be pressed in the downward

direction by such a force to engage into reliably
into

 

second groove.

16 of 18

         JAWA 50 type 20, 21, 23, 23A Owners Handbook page 55 to 57

         

jkw

Summary of Contents for 50

Page 1: ...lter 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 Adjusti...

Page 2: ...ear 10 27 to 1 11 13 to 1 Carburettor Jikov 2917 PSb Wheels front and rear interchangeable rims 1 50 A x 16 in tyres 2 75 x 16 in Internal expanding brakes dia 125 20 mm Front wheel suspension telescopic fork suspension travel 90 mm Rear wheel suspension pivoted rear fork with dampers suspension travel 85 mm Magneto 6V with windings for feeding the ignition coil the headlamp bulb 15 15 W and the i...

Page 3: ... p h 17 km p h Second gear 20 m p h 35 km p h Top gear 30 m p h 48 km p h Do not ride in bottom gear for too long For the first 400 miles 1 person may drive the machine only c On long uninterrupted rides it is recommended to cool the engine by switching off the ignition from time to time and opening the throttle especially when riding downhill d When stopping let the engine run at idling speed e D...

Page 4: ...m p h 18 34 km p h Top pear 10 to 31 m p h 30 50 km p h Riding up hill As soon as the engine revolutions begin to drop when riding uphill change to lower gear To change from top to second gear change lever up Changing down has to be done more quickly than changing up the climbing machine would otherwise lose speed while the clutch is depressed Engage bottom gear in the same way Braking When riding...

Page 5: ...d under the dual seat The remaining tools are fastened to the frame with rubber bands under the front cowl II MAINTENANCE 1 CLEANING THE SCOOTER The simple smooth lines make the cleaning of the scooter easy Use water for washing preferably with a sponge Wash with paraffin the parts that have been soiled oil and dust When washing take care to keep the carburettor headlamp and brakes clear of water ...

Page 6: ...60 70 C and move it from time to time to make the warm mixture penetrate the chain links better Then take out the chain let the lubricant solidify and remove the surplus grease from the surface The chain is ready to be refitted When assembling take care that the connecting link spring clip does rotate with its full end in the direction of the chain rotation Otherwise clean the secondary chain on t...

Page 7: ...flexible shaft after detaching oil some drops 11 Brake cams 12 Kickstarter pedal pin 13 Centre stand pin 15 Steering head grease after dismantling and washing 17 Speedometer drive gear 18 Rear suspension telescopic dampers top up if necessary 30c c of damper liquid per damper damper oil shock oil damper oil X 100 20 W When dismantling grease the damper spring with grease Castrolease CL Shell Retin...

Page 8: ...d remove the tube Having screwed in the valve core and inflated the tube partially the punctured spot is best located by plunging the tube into water Mark the punctured spot e g with a copying pencil dry the tube and repair it as follows Rub the punctured spot slightly with a piece of sandpaper Smear the rubbed spot with rubber solution Allow the solution to dry and only then press on the patch fi...

Page 9: ...t air screw 3 has to be in its correct position Adjust the length of the throttle control cable with the grooved screw 4 in the carburettor top only when the idling speed has been correctly set When starting flood the carburettor by tickling the tickler pin in the float chamber lid 2 Fig 21 This makes the level in the float chamber rise thus creating a richer mixture and thereby more favourable co...

Page 10: ...he contact breaker point gap 3 to approx 0 4 mm 16 thou having slackened the screw 2 When the gap has been set tighten the regulating screw 2 Insert a cigarette paper between the contacts 3 and rotate slowly the crankshaft in the opposite direction of the engine rotation till the paper passes through the gap This will occur when the gap between the points is sufficient for the paper to be removed ...

Page 11: ...obs up to the general overhaul it will facilitate your task of regular servicing After a general overhaul the maintenance is the same as that of a new machine after the indicated mileage covered Note The numerals in brackets refer to the lubrication points Mileage Covered Operation 0 1000 3000 15000 5000 17500 7500 20000 10000 22500 12500 Note 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ...

Page 12: ...from the gear pins of the chain wheel place it to the upper rear part of the rear cowl take off the brake back plate from the wheel g Catch the motorcycle at the grip on the rear cowl and lift it in so that the wheel could freely fall out To replace A Check the position of the brake cable rest in the brake lever B Place the wheel into the upper rear part of the rear cowl push the brake back plate ...

Page 13: ...three M6 x 10 screws fastening the seat to the frame Disconnect the yellow lead leading to the tail lamp from the bakelite terminal After unscrewing two M6 nuts in the top portion of the rear cowl one M6 x 10 screw fastening the cowl to the frame and four M5 x 10 bolts with nuts holding the cowl to the footboard pull lightly and lifting remove the cowl 3 When removing the front shield remove first...

Page 14: ...sary to remove the headlamp cowl a Remove the rim with reflector and disconnect the leads from the socket b Remove the front cowl and the R H engine side cowl c Disconnect the throttle cable from the carburettor see Part III Para 14 d Disengage the control cables from both handlebar levers Para 14 and 16 e Disconnect the speedometer flexible shaft Para 13 f Unscrewing two M3 nuts disconnect both l...

Page 15: ...ng disconnect the throttle cable and remove the throttle valve together with the top d Slacken the two studs in the twist grip retention cap e Turn the twist grip so as to enable unscrewing of the screw securing the plug in the handlebar through the side opening Pull off the grip together with the plug f Lift the catch link and remove the throttle cable end Pull out the retention cap together with...

Page 16: ...g ridden a short distance tighten all screws bolts and nuts SEIZURE OF STARTING SEGMENT In case of seizure of starting segment or in case of ineffective depressing the starting lever to avoid the quick wear and damaging the starting transmission the following procedure is required 1 Starting lever be returned to the former position 2 Be engaged the bottom gear 3 Move the vehicle ahead by some cms ...

Page 17: ...same for all types except the version of alternator magneto of type 23 The type 23 has the alternator of 30 W output for headlight 25 25 W and rear light 5 W type 23 has the alternator as the types 20 and 21 having the 20 W output for headlight 15 15 W and rear light 5W The wiring diagram of electric equipment of both types is in fig 39 The numbering of electric equipment is identical as with type...

Page 18: ...amaged bakelite lead terminal Turn lever to correct position Replace ignition coil Wipe points with cloth dipped in petrol File with fine file Have contact breaker points repaired or replace Replace lead if impossible connect and insulate with tape but replace soon Tape lead but replace lead as soon as possible Replace condenser Have magneto repaired Blow water out dry carefully or let dry Replace...

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