Carburetor Idle Speed Adjustment - SANYANG INDUSTRY CO. SYM Service Manual

SYM
VALVE CLEARANCE INSPECTION
AND ADJUSTMENT
Check & adjust valve clearance with feeler
gauge.
Valve clearance (IN/EX):
0.05±0.02 mm/0.10±0.02 mm
Loosen fixing nut and turn the adjustment
nut for adjustment.
Caution
It has to make sure that valve-rocker 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 warm up
(around 10 minutes).
Park the motorcycle with main stand and
warn up engine.
Open the carburetor cover from the luggage
box.
Turn the throttle valve stopper screw to
specified idle speed.
Specified idle speed: 2100±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 2100±100 rpm.
3. Insert the exhaust sampling muffler 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 4.5%
HC: below 800ppm
2. MAINTENANCE INFORMATION
Ignition coil cable
Valve clearance adjustment
Throttle valve stopper screw
Air adjustment screw
2-7