FUEL SYSTEM
22
IDLE ADJUSTMENT
Start and warm up the engine for about 3 minutes, so that the
engine will operate in normal running temperature. Adjust the idle
adjustment screw (1) and set the idle speed to 1800 U/min.
Create a round and stabile engine speed, using the air/ fuel con-
trol screw (2).
Reset the idle adjustment screw (1) and set the engine speed
down to 1200-1500 ± 100 U/min.
Pull the throttle for several times for acceleration and inspect
whether the idle speed is steady.
CARBURETTOR ADJUSTMENT
Attention: When the vehicle is ready for sell, the idle adjusting
bolts have already been adjusted, so they generally require no
adjustment. When dismantling the carburettor, the number of
turning of the bolts should be recorded because this is very help-
ful during the installation.
Switch on and warm up the machine for about 3 minutes, so that
the engine will operate in normal running temperature;
Adjust the idle adjustment bolts and set engine speed to be 1800
U/min.
Screw the mixture adjustment bolt to the end with proper force.
At this point the engine will stall, if not inspect whether air es-
capes at the interface of air lter, whether the bolt is tightened and
whether the intake of the air lter is blocked;
Withdraw the mixture adjustment bolt for 1 1/2 circle anti-clock-
wise;
Slowly adjust the mixture adjustment bolts anti-clockwise, till the
engine speed reaches its utmost mixture.
Reset the idle adjustment screw and set the engine speed down
to 1200-1500±100 U/min.
Pull the throttle for several times for acceleration and inspect
whether the idle speed is steady.
Test the outlet and compare it with the specied standards.
FUEL HOSE INSPECTION
When working on the carburettor, engine and during each main-
tenance work, check the fuel lines (3). Please note that this may
not be brittle or leaking. Leaking fuel can ignite and cause serious
injury and damage.
!
WARNING
If the fuel line is brittle or leaking it must be replaced immediately.
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