JAWA 50 Specification And Operator's Manual - page 6
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The clutch: runs in an oil bath (oil from the
gearbox).
Telescopic front fork: lubricate, after every 600
miles (1000 km); put the oil diluted grease into the
fork legs by means of grease nipple after screwing
off two screws M6 x 7 at the back part of
telescopic fork (behind the headlamp). Having
covered 3,100 miles (5000 km) dismantle the fork
and lubricate carefully with grease.
Wheels (bearings)
have to be lubricated every
1,500 miles (2500 km). Dismantle the wheels (see
Part III, Para 3-4), wash the bearings in benzine,
dry and fill them with grease. Fill up with grease
the space of sealing rings at the shaft
approximately to one third to avoid the penetrating
of impurities and moisture. Do not overfill the
wheel hubs!
The pivoted rear fork telescopic oil dampers are
highly efficient and are so arranged that there is no
need to top up the damper liquid. Top up the
damper liquid only it the pivoted rear fork is
oscillating freely or bottoming or if the liquid is
leaking. Otherwise change the oil once in two
years. Entrust the topping up or the change of
liquid to a specialised workshop.
The primary chain is completely enclosed by the
L. H. crankcase cover, runs in an oil bath and does
not require any maintenance. If worn or stretched
too much it has to be replaced. If the primary chain
has to be replaced, it is necessary to dismantle also
the clutch. It is recommended to entrust this repair
to a specialised workshop equipped with the
necessary tools.
The secondary chain has to be serviced every
l,500 miles (2,500 km) as follows; Rotate the chain
until the connecting link reaches the rear chain-
wheel, slacken the spring clip with a screw driver
(Fig. 12), remove it, and the chain is disconnected.
Wash it in paraffin and remove the coarse
impurities with a wire brush. Then rinse again
thoroughly in paraffin. Let it dry and then place it
for about 30 minutes into a slightly warm lubricant
(approx. 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 the
machine with wire brush and lubricate it, if
necessary, after approx. 500-600 miles (800-1,000
km) by means of a paint brush. Running
permanently in rain and on mud roads shorten the
lubrication time properly.
Caution. The cylinder and crankshaft mechanism
have to be sufficiently lubricated with oil. Lack of
oil in the fuel causes seizure of the crankshaft
mechanism. Therefore it is necessary to mix petrol
and oil in the correct ratio. This ratio is not always
correct when refuelling at automatic fuel stations
after a vehicle with a four-stroke engine taking
clean petrol. There may be too little oil in the
mixture. It is therefore preferable to mix the oil
and the petrol in a can to the correct ratio.
3. ADJUSTING THE BRAKES
The brakes of the machine are sufficiently
dimensioned. They require only periodical
adjustment due to wear of the brake shoe lining.
To adjust the brakes, the brake cable has to be
lengthened (shortened) by tightening (or
loosening) the adjusting nut (see Fig. 13). Should
it not be possible to adjust by tightening or
loosening the nut it is necessary to reset the brake
lever on the splined shaft and only then to adjust
by means of the nut. After adjustment, check the
wheels for easy rotation. The wheels have to rotate
freely.
Setting the stop switch
The tail lamp bulb is operated by the stop light
switch fastened on the R.H. footboard. After
adjusting the rear wheel brake, check and set the
stop switch so that the light is switched on at the
same time as the foot brake begins to act. To same
time as the foot brake begins to along the slot and
tighten the fastening screws. The tail lamp bulb
employed is 6 V 10 W.
6 of 18
JAWA 50 type 20, 21, 23, 23A Owners Handbook page 20 to 25
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