Crankcase Blow-By Ventilation; Valve Clearance Adjustment - Sym Mio 50 Service Manual

2. Maintenance Information
Primary adjustment is conducted from cable
button side.
Loosen fixing nut, and adjust by turning the
adjustment nut.
Tighten the fixing nut, and check acceleration
operation condition.

Crankcase Blow-By Ventilation

Pull out the plug from draining hose to clean
deposits
Caution
When always riding in rainy area or full
throttle position, maintenance travel must be
shorted. The deposits can be seen in the
transparent section of draining hose.

Valve Clearance Adjustment

Caution
Checks and adjustment must be performed
when engine is cold (below 35¢ J ).
Remove trunk
Remove central cover
Remove cylinder head side-cap.
Remove 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
The model that equipped with starting
compression pressure reduction system can
not be rotated in counter-clockwise to prevent
from operating compression pressure
reduction function so that valve clearance
can not be measured.
2-6
To this chapter contents
Adjustment nut
Blow-by hose
TDC mark
Ignition timing mark