The pre-adjustment of the carburettor for the first drives is a standard factory setting. The following tips and notes are therefore intended for cases

where your engine does not start up, does not run correctly or if you wish to adjust the engine optimally after the run-in phase. For this purpose, also

observe the information sheets enclosed in this operating manual and the information of the following sections.

The carburettor of the installed FORCE combustion engine is distinguished by a plastic and metal material combination. The low thermal absorption of the

plastic compared to a carburettor consisting entirely of metal reduces the premature evaporation of the fuel mixture in the carburettor.

This way, it is easier to adjust the fuel supply even if the engine is hot. Once a carburettor setting was selected, it remains reproducible and constant during

operation.

(1) Main nozzle needle (mix adjustment screw)

The main nozzle needle is located above the fuel supply to the carburettor. It is ad-

justed 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 to "lean" the mixture (reduce the fuel ratio) or anti-clockwise

to "enrich" the mixture (increase the fuel ratio).

The basic setting for the very first start should be selected in such a way that the main

nozzle needle is completely screwed in and then turned out by two to three rotations.

(2) Throttle stop screw (idle speed-adjusting screw)

As a standard factory setting, the throttle stop screw (2) is already pre-adjusted and

should not be adjusted without any reason.

The adjustment screw for idle running controls the position of the carburettor slider

(the throttle stop) and thus the carburettor aperture at idling speed.

We recommend an opening of approx. 1 – 1.5 mm.

One clockwise rotation of the adjustment screw increases the aperture, (idle speed

increases); one counter-clockwise rotation causes the slider to retract more and there-

fore reduces the gap (idle speed is reduced). If the gap is less than 1 mm, the engine

may stop!

(3) Air intake opening

Here is where the air filter is mounted.

(4) Idle speed mix adjustment 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 when idle and in the transition interval to full throttle.

Turn the screw clockwise to "lean" the mixture (reduce the fuel ratio) or anti-clockwise to "enrich" the mixture (increase the fuel ratio).

Slight adjustment may be necessary later on depending on the fuel, glow plug and ambient conditions.

In order to reset the factory setting, proceed as follows:

• Open the carburettor slide completely

• Keep the slide open and turn the idle speed mix adjusting screw clockwise until it stops.

• Now unscrew turning it by 7.5 rotations anticlockwise.

• Afterwards, carefully screw in the main jet needle in a clockwise direction until it contacts the end-stop. Then unscrew it again with a total of 3 rotations in a

counter-clockwise direction.

Before starting the model, you need to cut ventilation openings in the body (e.g. side windows and rear window). For this, use a lexan scissors

If your do not observe this, the motor will overheat due to lack of cooling!

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