Reely Carbon Breaker Pro, Руководство по эксплуатации

Страница: 50 / 124

42
k) Checking the Basic Carburettor Setting
(H) Main nozzle needle (mix adjustment screw)
The main nozzle needle is the rear (larger one) of the two adjustment
screws. It is adjusted for the first start of the engine and should not be
modified yet.
The main nozzle needle regulates the air / fuel mix from the middle speed
range to full throttle.
Turn the screw clockwise to "thin" the mixture (to reduce the fuel
component of the mixture) and anti-clockwise to make the mix "richer"
(to increase the fuel component).
The main nozzle needle can be adjusted only under load! Under load,
the mix tends to be leaner.
(1) Throttle stop screw (idle speed-adjusting screw)
The throttle stop screw is the lower, single adjusting screw. It is already
set and should not need any readjustment. The idle adjustment screw
regulates the position of the throttle valve (the throttle stop) and thus the
air passage at idle speed.
When screwed in, the conical spike of the screw pushes a lever on the
rotary axis of the throttle valve downward, and thus opens the gap. When
it is loosened, the throttle valve closes.
(L) Idle speed mix adjustment screw
The idle speed mix adjustment screw is the smaller screw in the front. It is adjusted for the first start and should not be modified yet. The idle speed mix adjusting
screw regulates the air/fuel mix in the idle and transition intervals to full throttle via a needle valve.
Choke
With the choke valve, the air supply from the outside to the carburettor
can be cut off to a large extent. Thereby, the mix is enriched for a short
time, which facilitates the start of the cold engine. If the choke valve
remains shut too long, the mix becomes too rich, the engine is "flooded"
and it stops.
Spark plug
One can recognize the setting of the carburettor by looking at the state of
the spark plug.
If the electrode is white or very bright, the mix is too thin and must be
enriched A black and/or a slightly moist electrode indicates a mix that is
too rich.
Thin the mix in steps in order to achieve a better driving performance. A
middle brown electrode indicates a perfect carburettor adjustment.
Also check the electrode clearance to the spark plug occasionally with a
feeler gauge (ideal = 0.7 mm).
Too big a clearance causes misfiring; too small a clearance causes
"continuous fire" and advanced ignition.