JAWA 50 Specification And Operator's Manual - page 11
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10. DECARBONISATION
After every 3,000 miles (5,000 km) it is advisable
to decarbonise the engine (for the necessary
dismantling see Part III). Burnt fuel residues
(carbon) cause a drop in engine power.
During the
period of running in when there is more oil in the
mixture
it is necessary to clean the exhaust
silencer after the first 900 miles (1,500 km).
After
the running in period decarbonise the
exhaust
silencer after every 1,500 miles (2,500km). To
decarbonise the exhaust silencer (Fig.
26) proceed
as follows:
a) With box spanner 10 remove the nut M6 (3) and
remove from the welded rod the end piece (11)
together with the four-hole-plug (12).
b) Remove the end cone (10) and baffle (7). If the
baffle is very clogged with carbon and cannot be
pulled off the rod and the silencer body (6) easily,
use a bent steel wire approx.12in. (300 mm) long
and insert the bent end into one of the two
openings in the baffle. Grip the other end of the
wire with pliers and pull off the baffle.
c) Clean the dismantled parts with a wire brush
and scrape off the carbon from the holes in the tail
cone with a sharp steel tool. If the chromium
plated parts are very clogged, it is possible to
"burn them out" (take care, as there is risk of fire,
to carry out this operation in the open space).
d) Scrape out with a sharp steel tool the holes in
the baffle which is welded in the silencer body as
well as the annular diffuser and heating. The
carbon deposited on the top part of the piston, in
the cylinder head and exhaust ports is best
removed by careful scraping. At the same time
remove the carbon from the piston ring grooves
(using an old broken piston ring).
When assembling be careful to fit the ring into
their original grooves. Having removed the carbon,
wash the parts in petrol or paraffin.
Carbon deposits in the exhaust silencer cause the
oblong openings in the rod (see the illustration).
Clean also the other parts of the exhaust silencer
after dismantling.
11. SCOOTER MAINTENANCE TABLE
If regular maintenance is carried out the scooter will give you full satisfaction. Rely on the summary table of
all the maintenance jobs up to the general overhaul; it will facilitate your task of regular servicing. After a
general overhaul the maintenance is the same as that of a new machine after the indicated mileage covered.
Note: The numerals in brackets refer to the lubrication points.
Mileage Covered:
Operation
0
1000
3000
15000
5000
17500
7500
20000
10000
22500
12500
Note
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
Thorough cleaning of the scooter
Check tyre pressure — inflation
Check the lights and buzzer
Check and adjust the brakes
Check the sparking plug, clean it and set the point gap
Decarbonise the exhaust silencer
Decarbonise cylinder head, piston, exhaust port and exhaust pipe
Clean the induction silencer (9)
Check and tighten all leads in their terminals, & lead insulation
Check and tighten spoke nipples
Check and tighten all surface screws, bolts, nuts, and
pins, incl. engine fastening studs
Check and clean the carburettor and the fuel tap
Check and adjust the clutch
Clean the contact breaker points and check the ignition advance
Lubricate the contact breaker arm pin and felt (7)
Clean and lubricate the rear chain on the machine (10)
Check the rear chain tension
Remove the rear chain, wash and lubricate it with graphited
grease. Fit and adjust (10)
Lubricate the hand lever pins (2) and foot brake pedal pin (3)
Lubricate the telescopic front fork (4)
Lubricate the wheel ball bearings (6)
Lubricate the twist grip (8)
Check and top up oil in the gearbox (5)
Change the oil in the gearbox (5)
Lubricate the throttle, clutch and brake control cable (14)
Lubricate the kick starter pedal pin (12), centre stand pin (13),
speedometer drive (17), brake cams (11), and speedometer
flexible shaft (16)
Lubricate the steering head ball bearing (15)
Check the operation of the pivoted rear fork dampers, if
necessary, top up the damper liquid.
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If necessary
Before every ride
Before every ride
Before every ride
If necessary
First time after
900 miles
Every 600 miles
Every 500-600 mi
11 of 18
JAWA 50 type 20, 21, 23, 23A Owners Handbook page 35 to 39
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