JAWA ZVL 210 Workshop Manual - page 13
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ZVL model 210 Workshop Manual Page 14
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Reassembling 2nd-speed clutch
Observe utmost cleanliness during the clutch re-assembly.
Degrease the drum (large pulley) with a degreasing agent
(e.g. alcohol, acetone, clean petrol, etc) and wipe it dry
with a clean cloth. The roughness of the drum working
(friction) surface must be at least 0.8, i.e. the surface must
be polished with fine emery paper. A rougher surface has
an unfavourable effect on the service life of the friction
lining.
Make sure that the GUFERO sealing ring (15 x 24 x 7) in
the drum is not damaged. Put the shoe carrier (base plate),
with the two 2nd-speed shoes mounted in position together
with the regulating driver located between them into the
drum. All parts must be dry, without any traces of oil.
If oil has got between the joint faces during the
dismantling, remove the 2nd-speed shoes and dip the
carrier in a solvent (degreasing agent). Then dry the carrier
thoroughly.
The hard chrome-plated lands of the regulating driver
which touch the brass friction layer on the shoes must be
bright, clean and dry. Rotate the shoe carrier together with
the regulating driver anticlockwise and fit the parts in their
position by a slight pressure of the hand.
Routine maintenance of the carburettor includes its
removal, flushing and swilling with clean petrol, and
blowing through with compressed air. Clean the jets only
with petrol (or acetone) and compressed air, never with
lengths of wire or other hard objects which are apt to
damage the calibrated holes.
To give the carburettor a thorough overhaul, proceed as
follows:
1. Remove the carburettor from the engine, take it apart,
and clean its parts thoroughly.
2. Discard worn parts and replace them with new ones.
3. Check the flatness of the flange and true it up if
necessary on an abrasive cloth stretched on a flat board.
4. After trueing up the flange clean the carburettor body
thoroughly once again.
5. Check the jets and adjustments for compliance with the
recommended values.
6. Adjust the needle and the fast-idling screw as
recommended and reassemble the carburettor.
7. Refit the carburettor on the engine. Start the engine,
warm it up, and adjust the richness of the mixture by
means of the air-correction screw. Then adjust the idling
speed (from 1,600 to 1,800 r.p.m.) by means of the stop
screw, and the needle valve and the free movement of the
twistgrip by means of the throttle cable guide.
Never touch the friction lining and the friction surface of
the drum with greasy hands. Place the ,’O’ sealing ring on
the recess (clean and undamaged) of the carrier hub and
locate the metal bush on the ,’O’ ring. Then apply a tube
of sufficient length and the same diameter as the bush on
the bush, and by rotating and pressing down the tube,
press the bush through the ‘O’ ring inside the hub. Then
install the inside driver which ensures that the regulating
driver controls both shoes at the same time. For this
reason, the holes must be perfectly clean and the parts
must have a certain clearance along the circumference
with the exception of the contact areas.
Locate the circular sheet-metal washer and the clutch
cover, and then screw down and tighten well the M10 x
1.25 nut
5. Carburettor (Fig. 21)
The moped is fitted with the JIKOV 2912 DC carburettor
with the following parts and adjustments :
Main jet
63
Idling jet
35
Needle valve
- needle position
2
nd
notch from top
Fast-idling screw
540º (1 to 1½ turns)