Checking Basic Settings Of Carburettor; Starting The Engine - Reely 4WD GP STREETHUNTER 4.1 Bedienungsanleitung

4 P
4.7
C
HECK CARBURETTOR BASIC SETTINGS
Fine tuning of idle speed and full throttle can only be
carried out with a well run in engine
The carburettor of "Hunter / Streethunter 4.1" is characterized
by a material combination of a new type made of plastic and
metal. The low thermal absorption of the synthetic material, compa-
red to a carburettor made of metal only, reduces the evaporation of
the fuel mixture already in the carburettor.
Thus, the fuel supply can be more precise, even with a hot engine
and can be regulated in a simpler way.
T
HROTTLE STOP SCREW
The throttle stop screw is the small screw next to the idle speed-mix adjusting screw.
It is already pre-adjusted; a readjustment should not be necessary. The idle
speed adjusting screw regulates the position of the slide carburettor (the choke
limit stop) and therewith the carburettor outlet in idle speed.
We recommend a carburettor outlet of approximately 1 mm.
Turning the adjusting screw clockwise widens the outlet, turning it anticlockwise cau-
ses the slide to retract further, which reduces the opening.
M
AIN NOZZLE NEEDLE
The main nozzle needle is located above the fuel supply to the carburettor. 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 by full throttle. Turn the screw clockwise in order to make the mix
"leaner" (to reduce the proportion of fuel) and turn it anticlockwise in order to make the mix "richer".
In the basic setting for the first start, the main nozzle needle must be completely screwed in then unscrewed by two to
three rotations.
I -
DLE SPEED MIX ADJUSTING SCREW
The idle speed mix adjusting screw is the little screw on the side of carburettor linkage.
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 idle speed and in the transition interval to full
throttle.
Turn the screw clockwise in order to make the mix "leaner" (to reduce the proportion of fuel) and anticlockwise, if the mix
should be "richer". Depending on fuel, glow plug used and environmental conditions, small modifications in the settings
might be necessary at a later time.
In order to reset the factory setting proceed as follows:
- Open the slide carburettor completely
- Keep the slide open and turn the idle speed mix adjusting screw clockwise as far as it will go.
- Now unscrew it turning it by 7.5 rotations anticlockwise.
4.8
S
TARTING THE ENGINE
C
OMBUSTION ENGINE
48
REPARATION
(idle speed-adjusting screw)
(mix adjusting screw)
The engine of Hunter / Streethunter 4.1 is equipped with an ABC assembly.
ABC means "Aluminum", "Brass" and "Chrome".
Aluminum with its relatively small thermal expansion and small weight serves as mate-
rial for the piston. The light piston allows high revolutions and quick load-cycle changes
through the small mass inertia. The cylinder is made of brass with chrome-plated contact
surface and has a slightly conical shape which narrows upwards (in the range from 1 – 2
micrometer). During operation, the upper part of the cylinder heats via the glow plug and
the combustion procedures; it expands, thus giving the cylinder sleeve its exact cylind-
rical shape for the optimal tuning of the piston. In this way, piston rings are preserved,
which reduces frictional loss to a minimum and excludes leakages. These engines are
manufactured according to high technical outlays with precision machining. However,
small manufacturing tolerances cannot be avoided, just as little as slight unevenness and
roughness of the material.
In addition, there are deformations due to thermal and mechanical stress.
Operating Instructions 4WD Chassis Hunter / Streethunter 4.1 Item No. 23 47 46 / 23 47 64
Air suction opening
Schiebevergaser (Abb. modellähnlich)
Main nozzle
needle
Throttle stop screw
Idle speed mix-
adjusting screw