Checking Basic Settings Of Carburettor - Reely ROAD Ice Land ARR Bedienungsanleitung

4 P
REPARATION
4.7
C
HECK CARBURETTOR BASIC SETTINGS
The engine of Monster Truck chassis „Ice Land" is equipped with an
ABC assembly.
ABC means "Aluminum", "Brass" and "Chrome".
Aluminum with its relatively small thermal expansion and small weight serves
as material 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 operati-
on, the upper part of the cylinder heats via the glow plug and the combustion
procedures; it expands, thus giving the cylinder sleeve its exact cylindrical
shape for the optimal tuning of the piston. In this way, piston rings are preser-
ved, 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 aredeformations due to thermal and mechanical stress.
Thus, when driving the new engine, a certain break-in time must be observed.
During the break-in time, engine parts tune to one another, whereby maximal capacity is reached and premature
wear is avoided.
Thus, the break-in procedure must be carried out with the highest accuracy!
The following must be observed during initial break-in:
- Low engine speed
- Rich fuel- air mix
- Short runtimes with cooling down phases (each phase approx. 3 minutes)
- Runtimes (mere engine runtime) totaling approx. 45 minutes
B
ASIC SETTINGS OF THE CARBURETTOR
The carburettor of Monster Truck "Ice Land" is characterized by
a material combination of a new type made of plastic and metal.
The low thermal absorption of the synthetic material, compared 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 carbu-
rettor (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 causes 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.
44
( -
IDLE SPEED ADJUSTING SCREW
(
MIX ADJUSTING SCREW
Schiebevergaser (Abb. modellähnlich)
Throttle stop screw
)
)
Operating Manual 4WD GP Monster Truck Chassis Item No. 23 43 60 / 61
Air suction opening
Main nozzle
needle
Idle speed mix-
adjusting screw