~~
1'[
"'
111.
1
1,.,
Clc"";ing.
The bowl 01 the carburetter should be removed occasionally ./or
cleaning. Take out the two retaining bolts and the bowl will drop
into the hand. On turning the bowl upside down the float willlall ,out and
reveal the main and compensating jets at the bottom 01 the bowl.
7
I
~
'I'
3
1
2
The Carburetter Bowl.
l M.in '0<
3 C.",i" w.ll
5 Emul.lon blo,'
7 Rminin, bol<.
2 Com,.n.."n, ,0<
4 Slow.ronn'n, '0<
6 Non>.
8 Squm .nd '" 10= '0< «v.
j
The jets are removed hy litting into them the squared end alone 01
the retaining bolts and using a spanner on the other end. To clean
the jets wash them in petrol, and blow through them to remove obstruction.
Do not me wire.
The connection Irom the petrol pump should be dismantled and the
filter thoroughly cleaned in petrol. When reassembling take care that the
washers on either side 01 the union are correctly replaced.
:t
,
24
"
Standard Settings.
Sizes 01 Zenith jets normally run in 5's-the higher the number the
larger the jet.
Settings are likely to be varied to suit certain markets. Standard
settings are :-
Choke
Main Jet. oo
Compensating Jet...
Slow-running Jet .oo
Progression Jet
Needle Seating
Capacity Tube
17
57
50
60
50
1.5mm.
2
"Leaded" Fuels,
Provided that the same reasonahle attention is given to the valves and
other adjustments as with ordinary petrol there will be no trouble when
using "leaded" fuel (petrol containing a small proportion 01 tetraethyl
lead). '
The appearance 01 the valves when running on "leaded" fuel dillers
Irom that associated with ordinary petrol but this is a well recognised lact
to which no signilicance should be attached.
The deposit from such fuels can be removed by "scrubbing" the
valves and their seats with a still wire brush 01 the type used lor cleaning
liles (a "Iile card"), alter which the valves can he ground-in in the normal
manner.
We would recommend this method 01cleaning lor all valves, whether
they have operated with leaded or ordinary fuels, as it eliminates the
possibility 01 leaving small amounts 01 deposit on the valve seats which
tend to cause damage or prolong the "grinding-in" process.
Air Cleaner.
On export models an oil wetted air cleaner is litted to the carburetter.
At Irequent intervals, say weekly in countries where dust is constantly
experienced, the silencer needs cleaning and re-oiling. It is taken 011
the carburetter by undoing two nuts and it should be swilled in a shallow
pan 01 petrol.
After drying, the metal gauze mesh should be re-oiled with engine oil,
allowing the surplus to drain 011belore relitting the cleaner.
11the air cleaner is neglected it becomes choked with dirt, so that the
cleaning elliciency of the device and its valuable protection against engine
wear are not maintained.
25
I
I'
11
11
11
I
li /
!
J
ijl
To Next Page
Loading...