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10 Carburetor
Preparation data-------------10.1 Float chamber -------------10.5
Fault diagnosis-------------10.2 Installation of carburetor -------10.6
Disassembly of carburetor-----------10.3
Carburetor cover -------10.4
10.1 Preparation data
Matters needing attention in operation
*Note
·Gasoline is extremely dangerous，so smoking or lighting is strictly forbidden in operational field.
·Pay special attention to flakes.
·No wire should be pulled and bent with rudeness. Distortion or damage will have impact on wire actuation.
·After the carburetor is disassembled， choke the intake manifold with clothing to prevent entry of foreign
objects.
·If the carburetor is not in use for more than one month, the gasoline inside the float chamber must be
discharged. Otherwise, the gasoline inside the float chamber will deteriorate and block the idle speed nozzle,
resulting in insecurity of idle speed.
Function of the carburetor：the carburetor is a critical component in the fuel delivery system of the
engine, the operating mode of which carries direct influence on the steady operation of the engine , its driving
force and economical indicator. The carburetor atomizes a given amount of gasoline into mini drops, which
then evenly mix with varying volumes of air to shape vaporous combustible mixture according to different
operating conditions of engines, and supplied to the engine in time, in order to ensure normal continuous
running of it.
Preparation reference
Unit：mm
Item Standard value
Throat diameter 17.5mm
Main nozzle B03
Main jet 95#
Idle jet 22.5#
Needle valve B05-Z
10.2 Fault diagnosis
Bad startup Startup difficulty，flameout after startup， unsteady idle speed
·No flashover in spark plug · Fuel system blockage
·Compression pressure too low · Bad ignition
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