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D. How to prevent defects
If the instructions for running in and further
maintenance are not followed defects may occur.
The most frequent consequence of incorrect
running in is sticking of the piston rings in their
grooves, the result of which is a lowered engine
output, or even a seized piston.
Incorrect running in often does not manifest itself
in a visible detect, but in premature wear of
different parts and a considerable increase in fuel
consumption.
Seizing of the piston is mostly caused, by engine
overheating, which is usually accompanied by a
characteristic slight pinking. As soon as you hear
this sound switch the ignition off so that the fresh
un-ignited mixture can cool off the engine.
If the engine starts losing power it is also due to
seizing; it is necessary to declutch and stop. If the
piston has seized, let the engine cool off and then
try to restart it. On your return check the piston,
piston rings and the cylinder inside. Should a
repair be necessary, entrust it to a specialised
workshop.
It is harmful to let the engine run while it is
standing as it is not being cooled. Do not keep it
declutched for any considerable time as the cork
inserts of the clutch plates would be subject to
unnecessary wear. Never help the engine uphill by
letting the clutch ,,slip", but engage a lower gear in
time. Do not ride in lower gears for too long.
4. LIST OF TOOLS
NECESSARY FOR
MAINTENANCE OF THE JAWA 50 SCOOTER
1. Tool kit
2. Box Spanner 14/17
3. Open double ended spanner 8/10
4. Box spanner 10
5. Handle dia. 5
6. Combined spanner 32/27
7. Contact breaker
point gap feeler gauge
8. Screwdriver 3 mm
9. Tyre inflator
11. Rubber tube 12. Sparking plug spanner
13. Double ended screwdriver
14. Lock
The tyre inflator is located under the dual
seat. The
remaining tools are fastened to the frame with
rubber bands under the front cowl.
II. MAINTENANCE
1.
CLEANING THE SCOOTER
The simple smooth lines make the cleaning of the
scooter easy. Use water for washing, preferably
with a sponge. Wash with paraffin the
parts that
have been soiled oil and dust.
When washing take
care to keep the carburettor
headlamp and brakes
clear of water.
Wipe dry chromium plated and enamelled parts
and polish them with flannel or chamois leather.
The enamelled parts should be polished now and
then with an enamel polish. To remove the water
from the cylinder cooling fins, start the engine;
its
warmth will cause the water to evaporate.
Note. Petrol, paraffin and oil dissolve rubber
(tyres, handlebar grips, footrest sleeves, rubber
blocks of the pivoted rear fork and footboard
rubber). Therefore protect the rubber parts from
contact with the liquids mentioned.
2.
LUBRICATING THE SCOOTER
To lubricate the scooter see the Lubrication Chart.
The engine is lubricate automatically
by adding oil
to the fuel at the ratio stated
in the Lubrication
Chart.
The gearbox:
top up the oil every 600 miles
(1000
km) up to the inspection hole in the L. H.
cover.
Change the oil having covered the mileage
stated
in the Lubrication Chart after a ride while
both the
engine and oil are warm. Drain the
old oil through
the draining hole in the crankcase bottom. Through
the filling hole (Fig. 6)
pour into the gearbox
(approx. 400 c.c. - 24 cub.in.) rinsing oil and let
the engine run at low revolutions for about 10
minutes (ride a short
distance). Change to all
gears. Then drain the
rinsing oil into a clean
vessel, let the impurities
settle down and pour off
the clean oil for use
next time. Replace the
draining screw and refill
with fresh oil up to the
inspection hole in
the L. H. cover (approx. 500 c.c.
- 34.9 cub.in.). Do not forget to replace the
washers
correctly.
5 of 18
JAWA 50 type 20, 21, 23, 23A Owners Handbook page 16 to 20
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