4. Fuel System
4-2
Operational Precautions
General Information
Warning
Gasoline is a low ignition point and explosive materials, so always work in a well-ventilated place and
strictly prohibit flame when working with gasoline.
Caution
z Do not bend or twist throttle valve cable. Damaged cable will make unstable drive ability.
z When disassembling fuel system parts, pay attention to O-ring position, replace with new one as
re-assembly
z There is a drain screw in the float chamber for draining residual gasoline.
z Do not disassemble automatic by-starter and air cut-off valves arbitrarily.
Specification
Specification
Item
HU10U/W HU05U
Venturi diameter 20 mm 16.6 mm
I.D. number 049B 001
Fuel level 16.0mm 17.75mm
Main injector # 95 # 88
Idle injector # 38 # 35
Idle speed 1700±100 rpm 2000±100 rpm
Throttle handle free play 2~6 mm 2~6 mm
Fuel quantity adjustment screw 2 5/8±3/4 turns 2±1/2 turns
Torque value
Fuel valve tightening nut: 1.5~2.0Kgf-m
Special service tools
Vacuum/air pressure pump
General service tools
Fuel level gauge
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