SANYANG INDUSTRY CO. SYM, Service Manual

Page: 27 / 176

2. MAINTENANCE INFORMATION SYM
2-6
Primary adjustment is conducted from button
side.
Loosen fixing nut, and adjust by turning the
adjustment nut.
Tighten the fixing nut, and check
acceleration operation condition.
CRANKCASE VENTILATION
Pull out the plug from draining hose to clean
deposits
Caution
VALVE CLEARANCE ADJUSTMENT
Caution
Remove luggage box and front center cover.
Remove the left body cover & left side cover.
Remove cylinder head cap.
Remove the ignition timing check hole on the
cooling fan cover.
With “T” type wrench, turn crankshaft in
clockwise motion so that mark (“T”) on the
generator flywheel aligns with the mark on
the crankshaft, and camshaft is at TDC
position also as same as level of cylinder
head top-end. A single hole on camshaft
sprocket is forward to up. (Piston is at TDC
position in the compression stroke.)
Caution
When always riding in rainy area or full
throttle position, maintenance period must
be shorted. The deposits can be seen in
the transparent section of draining hose.
Checks and adjustment must be performed
when engine is cold (below 35
℃
).
The crankshaft can not be rotated in
counter-clockwise to prevent from damage
so that valve clearance can not be
measured.
Ignition timing mark
Adjustment nut
Fixing nut
Crankcase blow-by system
TDC mark