Sym MAXSYM 400i Service Manual page 58

Throttle Body
Throttle positioning screw
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Functional Description:
Throttle body is the inlet air flow regulating device (similar to the
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carburetor).
Throttle valve pivot drives the throttle position sensor synchronously
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and makes ECU detect the throttle opening immediately.
Throttle valve positioning screw has been adjusted and marked on the
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production line. Readjustment is not suggested.
Treatment of abnormal phenomena:
If all fuel injection associated components identified no adverse, and
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other traditional engine components are also normal, the engine is still
not smooth, please confirm whether the throttle body coke serious.
If coke serious, please clean throttle body, and then adjust the injection
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system.
4. Fuel Injection System
4-15