Operator’s Manual 125 MAX DD2 evo
Page 56/70
Edition 09/2016
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Note:
In a disassembled carburetor, the position of the jet needle (pos. 3) can be changed.
The standard position of the jet needle is ‘position 2’. If the clip (pos. 4) is set in
‘position 1’ of the jet needle, the full mixture in part and full-load will become slightly
leaner. If the clip (pos. 4) is set into ‘position 5’, the fuel mixture will become slightly
richer in the part and full-load range.
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Note:
The fuel filter (pos. 32) is located below the fuel inlet on the carburetor, preventing
contamination from entering the carburetor, which could impair operation of the
carburetor.
¢
Attention: The fuel filter (pos. 32) must be inspected periodically and cleaned as required.
Æ
Remove the hex. screw (pos. 34) and gasket ring (pos. 33).
Æ
Pull out the fuel filter (pos. 32) and clean the filter and fuel inlet.
Æ
Refit the fuel filter (pos. 32), the gasket ring (pos. 33) and hex. screw (pos. 34).
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Note:
When trying to start the engine, it will take a few seconds for the fuel pump to fill the
float chamber and for the engine to start.
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Note:
With the adjustment screw (pos. 36), the idle speed of the engine can be adjusted.
By turning in the adjustment screw (pos. 36) the idle speed increases and by turning
out the screw (36) the idle speed will be reduced.
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Note:
With the adjustment screw (pos. 31), the fuel mixture formation can be adjusted. By
turning in the adjustment screw (pos. 31), the air-fuel mixture will become richer at
idling and by turning out the screw (pos. 31), the air-fuel mixture will become leaner
at idling. The default setting of the adjustment screw are two full turns and one
quarter of a turn (2 ¼) from inside to outside.
4.2.
Choice of gear ratio
In spite of its 2 gears, the 125 MAX DD2 evo engine offers a broad performance band. Therefore,
the frequent changing of the primary gear ratio is not necessary.
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Note:
It is not possible to change the 1
st
and 2
nd
gear individually.
On most of the Kart circuits you will be well served with the standard gear ratio (35/62, which is
equivalent to 12/90 for 1
st
gear and 14/79 for 2
nd
gear).
If, due to the special shape of the circuit (e.g. extremely sharp corners or long straights), it is
deemed necessary, the primary gear ratio can be changed to both, a shorter or a longer ratio.
If the rpm range from 9.200 to 12.200 rpm is not sufficient because of a particular track shape
(extremely long straight), the maximum engine speed of 13.600 rpm should be aimed for.
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Note:
A basic requirement for the full use of the speed range between 12.200 to 13.600
rpm is an optimized carburetor jetting (see chapter 4.1. Carburetor calibration).
The acceleration potential between 9.200 and 12.200 rpm is essentially higher than between
12.200 and 13.600 rpm Therefore, it does not always make sense to use this rpm range (high top
speed on a straight) and to not take advantage of the acceleration potential of the lower rpm range
(out of sharp corners).
