Generic Race 50, Service Manual

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149
XI. Carburetor
Preparation data------------------------11.1
Fault diagnosis-------------------------11.2
Disassembly of carburetor------------11.3
Installation of carburetor -------------11.4
Adjustment of carburetor ------------11.5
11.1 Preparation data
Matters needing attention in operation
·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
Main nozzle
47.5
Main jet
80#
Idle jet
15#