- The screw final position should be determined by an exhaust fume analysis.
- Adjust the carburettor by turning the screw twice from the close position.
Walbro
- Before refitting, wash the carburettor body accu-
rately with petrol and compressed air.
- Pay special attention to the fuel supply pipe and
the plunger seat.
- For maximum circuit, check the air adjustment is
correct as shown in the figure.
- Carefully clean the air holes indicated in the fig-
ure.
- For the minimum circuit, make sure the following points are properly cleaned: air gauging, outlet section
controlled by flow screw, progression holes near the throttle valve.
N.B.
THE MINIMUM AIR IS CONTROLLED BY TWO ADJUSTMENTS. THE CUT-OFF ONE IS INDICATED
DIRECTLY IN THE CARBURETTOR BODY.
MSS X9 Evolution 250 Engine
ENG - 159
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