JAWA 50 Specification And Operator's Manual - page 9
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6. THE CLUTCH AND ITS ADJUSTING
The clutch serves to interrupt the torque
transmission from the engine to the gearbox. It is
necessary to de-clutch before changing gear in
order to protect gears from impact. The clutch runs
in an oil bath and does not require other
maintenance but the occasional adjustment of the
control cable.
To prevent excessive wear of the plate when the
clutch is slipping the plate has to be under
sufficient pressure, and therefore, the clutch lever
has to have a small play. After a certain normal
wear of the clutch plate this play disappears.
Sufficient play, therefore, has to be readjusted by
slackening the adjusting bolt in the middle of R.H.
crankcase cover (Fig. 20).Slacken the nut (1) and
the bolt (2) and having adjusted the play tighten
again.
Having checked the clutch lever play, retighten the
securing nut.
7. THE JIKOV 2917-PSb-CARBURETTER
The carburettor of the scooter has been set at the
works. For its correct operation jet 68 has been
employed. It is, therefore, not advisable to
manipulate with the carburettor except for
occasional cleaning. The carburettor has two jets in
all, main jet 68 (1 - Fig. 22) and idling jet 38 (2).
Between the two jets there is on the carburettor the
pilot air screw with spring (3),by which the engine
idling speed is set. To start the engine easily the
pilot 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 conditions for starting the engine. The
tickler pin is accessible through the opening in the
front cowl R.H. half.
If one of the jets gets choked never use wire or any
other hard tool to clean it, as this would damage
the delicate jet hole, which, again would influence
the consumption and operation of the engine. The
jets are best cleaned by rinsing in petrol and
blowing. The jets are to be reached after loosing
the screw holding the tool box and after moving it
round a slight amount. The needle of the throttle
valve is adjusted for the breaking in period into the
third groove from top, after the machine has been
duly run-in, into the second groove from top.
The air cleaner is provided with microfilter
ensuring the perfect filtration of sucked-in air. The
cleaning of filter element is effected after every
300 km (1,800 miles) (in dusty atmosphere more
frequently) by beating the impurities and blowing
out with compressed air stream.
Microfilter is
neither washed nor oiled. The
change of
microfilter takes place after driving
10,000 -
15,000 km (6,000 - 9,000 miles).
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JAWA 50 type 20, 21, 23, 23A Owners Handbook page 29 to 33
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