JAWA 50 Specification And Operator's Manual - page 14
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When replacing the cylinder barrel
compress one
piston ring after the other and
turning it slip the
barrel on to the piston to the crankcase.
C. Provide the cylinder head seating face with
a
slight coat of sealing compound, fit it onto
the
cylinder and tighten with the four nuts.
D. Screw on the exhaust pipe and the carburettor.
E. Replace the tunnel, the front shield, the air
cleaner, the lead with terminal and the front
cowl.
F. Having ridden the machine for some distance
to warm up the engine, tighten the cylinder
head
nuts.
8. REPLACING THE PISTON RINGS
a) Remove the cylinder head and the cylinder
barrel (see Part III, Para 7).
b) It is preferable to remove the piston rings with
three thin steel sheet strips. Slip one strip under the
ring in the middle and the two at its ends and pull
the ring off (Fig. 33).
It is possible to remove the piston rings by merely
stretching them with the
fingers. But this has to
be done with great care
to avoid breaking the
ring. The piston rings
have to be replaced as
soon as the gap exceeds
0.8 mm (52 thou) (the
correct gap of the new
ring is 0.2 mm (8 thou).
To check the gap place
the removed ring into
the top portion of the
cylinder barrel.
To replace:
A. Fit the piston rings one after the other
according to Fig. 33.
B. Check the piston ring play in the grooves
by
rotating the rings.
C. Set the piston ring gaps against the pegs
in the
piston grooves.
D. Replace the cylinder barrel and head.
9. DISMANTLING THE HEADLAMP
The headlamp consists of two main parts: rim
with
reflector and cowl.
To remove the rim with reflector:
a) Unscrew the fastening screw on the bottom
side of the rim.
b) Tip the rim with reflector upwards and
remove.
c) If necessary, disconnect the leads from the
terminals.
If access to the bulb is necessary, the leads
need
not to be disconnected, it will be enough
to
compress the socket and rotate.
When reassembling before tightening the fastening
screw make sure that the rim is correctly fitted on
to the top portion of the headlamp nacelle. If the
front fork or steering head have to be
removed it is also necessary 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
leads
from the buzzer.
g) Using spanner # 10 slacken the handlebar
spindle and tapping with a wooden hammer free
the handlebar ring from the stem.
h) Pull out the handlebars with throttle cable
and
leads by slight rotation.
i) Unscrew with spanner # 10 two screws from
the headlamp nacelle and remove the brake and
clutch cables after tipping the cowl slightly.
To replace:
A. Pull the leads and the three cables through the
2 rubber grommets in the headlamp cowl
and at
the same time fit the stem with handlebars through
the third grommet to the steering
head and tighten
the handlebar spindle.
See that the spindle taper is
with several
threads on the spindle.
B. Fasten the headlamp cowl to the telescopic
front fork with two bolts and nuts.
C. Connect the speedometer flexible shaft.
D. Connect the brake and clutch cables to
the
handlebar lever (see Para 15 and 16).
E. Screw on the R.H. engine side cover with
three
screws and connect the throttle cable to
the
carburettor (see Para 14).
F. Screw on two green leads to the buzzer and
two blue ones to the headlamp socket.
G. Replace the rim with reflector and the
front
cowl.
10. DISMANTLING THE FRONT FORK
a) Remove the headlamp cowl (see Part III,
Para
9) and dismantle the choke coil from the covering
sheet.
b) Disconnect the top straps on the rubber
sleeves.
c) Using box spanner # 10 unscrew the nuts in the
top cups of the fork legs and to make
re-assembly
easier unscrew also the plugs.
d) Push the slider with spring downwards.
To replace:
A. Lubricate the sliders with grease and push
the
sliders with springs home.
B. Screw in the plugs and the # 10 nuts. Do
not
forget to insert the spring washers.
C. Replace the rubber sleeve straps and fix
the
choke coil on the covering sheet.
D. Make the front fork play.
E. According to Part III, Para 9 replace the
headlamp cowl and headlamp.
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JAWA 50 type 20, 21, 23, 23A Owners Handbook page 47 to 50
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