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8. ELECTRICAL EQUIPMENT
MAINTENANCE
Leads:
Check periodically and wind insulating
tape round all insulation cracks. Damaged
insulation can cause short circuits. Check all the
lead terminals.
The sparking plug:
Clean it periodically, care-
fully scrape off any carbon deposits and, if
necessary, adjust the point gap to 0.5 mm (20 thou)
by carefully bending the outer point of the plug
body.
The ignition coil
is fastened to the frame. It does
not require any maintenance. Check the lead from
the ignition coil to the sparking plug: this has to be
intact. Be careful with water when washing the
machine!
The buzzer
does not require any maintenance, this
is adjusted in the making works. The sound is
regulated by tightening or slackening the
regulating screw in the bottom buzzer housing.
The contact breaker:
After every 1,500 miles
(2,500 km) check the contact breaker lubricating
felt, its contact with the cam and whether it is
sufficiently oiled. The contact breaker and the
whole magneto have to be kept absolutely clean.
Be careful of dust and oil!
Ignition advance:
Remove the cylinder head.
Rotate the crankshaft (1 - Fig. 24) till the piston
reaches TDC (the piston is in its highest position).
In this position set the 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 (approx.
0.05 mm - 2 thou).
At this moment the piston should be 1,2 to1,5 mm
(7/64") before TDC. Measure the distance with a
gauge (Fig. 25). If the ignition advance is still not
correct, slacken the magneto clips (4) and rotate
the whole magneto. Then repeat the setting till all
the values are correct. Do not forget to retighten
the clips after the setting. Then check the ignition
advance and the contact breaker point gap.
9. HEADLAMP ADJUSTMENT (fig. 23)
1) The direction of correct and efficient road
illumination can be checked on the vertical wall.
2) The main headlight is adjusted at dimmed light
so that that the upper limit of light and darkness is
to be found at least 10 cm and at most 16 cm under
the horizontal straight line of headlight centre
height on the wall. The central beams of distance
light have to fall onto the wall at most 5 cm above
the straight line and at least 10 cm under the
horizontal straight line.
3) Adjustment the beam by screw A.
10 of 18
JAWA 50 type 20, 21, 23, 23A Owners Handbook page 33 to 35
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