Carburetor Idle Speed Adjustment - Sym Mio 50 Service Manual

Valve clearance inspection and adjustment
Check & adjust valve clearance with feeler gauge
after open the valve adjustment hole cap.
Valve clearance:
HU10U/W 0.12±0.02mm (IN/EX)
HU05U IN: 0.05±0.02mm EX: 0.10±0.02mm
Loosen fixing nut and turn the adjustment nut for
adjustment.
Caution
It has to make sure that valve rock-arm is be
adjusted to standard level when adjusting it,
and re-check the valve clearance after
tightened the fixing nut.

Carburetor Idle Speed Adjustment

Caution
Inspection & adjustment for idle speed
have to be performed after all other parts in
engine that needed adjustment have been
adjusted.
Idle speed check and adjustment have to
be done after engine is being warn up.
(around 10 minutes.)
Park the motorcycle with main stand and warn up
engine.
Connect tachometer (the wire clamp of tachometer
is connected to the high voltage coil).
Remove the trunk and seat cushion.
Turn the throttle valve stopper screw to specified
idle speed.
Specified idle speed:
HU10U/W 1700±100 rpm
HU05U 2000±100 rpm
Emission adjustment in Idle speed
Warm up the engine for around 10 minutes and
then conduct this adjustment.
1. Connect the tachometer onto engine.
2. Adjust the idle speed adjustment screw and let
engine runs in 1700±100 rpm.
3. Insert the exhaust sampling pipe of exhaust
analyzer into the front section of exhaust pipe.
Adjust the air adjustment screw so that
emission value in idle speed is within standard.
4. Slightly accelerate the throttle valve and
release it immediately. Repeat this for 2~3
times.
5. Read engine RPM and value on the exhaust
analyzer. Repeat step 2 to step 4 procedures
until measured value within standard.
Emission standard: CO: below 3.0%
HC: below 2000 P.P.M.
To this chapter contents
High voltage coil cable
Mixture adjustment screw
2. Maintenance Information
Throttle valve stopper screw
2-7