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XI
Carburetor
Preparatory data--------------11.1
Fault diagnosis--------------- 11.2
Carburetor removal---------- 11.3
Carburetor installation-------11.4
11.1 Preparatory Data
Precautions on Operation
· Gasoline is very dangerous. Fire and smoking are forbidden in working site.
· Pay specially attention to sparks.
· Please do not pull and bend wires and cables by force. Distortion and injury may affect operation of cables.
· When the carburetor is removed, plug the intake pipe side with a cloth in case foreign matters coming in.
· When the carburetor has not been used for more than one month, the gasoline inside the float must be drained. Since
gasoline inside the float may deteriorate, which will clog idle nozzle and idle may become dangerous.
Function of carburetor： Carburetor is one of the key parts for oil supply system of the engine. Its
working performance has direct effect on engine stability and power and economical indexes.
Carburetor can atomize gasoline into tiny oil drops and then mix them with certain amount of
air. Depending on different working conditions of engine, carburetor can form combustible
mixed gas of various concentrations and supply to the engine so that normal and continuous
rotation of engine is guaranteed.
Basic data
11.2 Fault Diagnosis
Poor starting
No fuel in carburetor
Item
Main nozzle
Main jet
Idle jet
Needle
Difficult start, stalling after start, unstable idle
Clogged carburetor
Unit: mm
Standard Value
A07
173
42.5
A08-3
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