Sym SYM series, Manual, Page: 116 / 178

4. FUEL SYSTEM SYM
4-2
PRECAUTIONS IN OPERATION
General Information
Warning
Cautions
Specification
Item Specification
Main jet 110#
Pilot jet 35#
Needle Jet
ø
2.6 mm
Mass of float 9.2g±0.4g
Float needle
ø
2.0 mm
Idle speed 1800±100 rpm
Fuel quantity adjustment screw 2 1/8±3/4 turns
Level in float chamber 18.5±0.5 mm
Jet needle DB4E2
Throttle handle free play 2~6 mm
Torque value
Fuel valve tightening nut: 1.5~2.0 Kgf-m
Tool
Special service tools
Vacuum/air pressure pump
General service tools
Fuel level gauge
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.
l
Do not bend or twist throttle valve cable. Damaged cable will make unstable drivability.
l
When disassembling fuel system parts, pay attention to O-ring position, replace with new
one as re-assembly
l
There is a drain screw in the float chamber for draining residual gasoline.
l
Do not disassemble automatic by-starter and air cut-off valve arbitrarily.