Sym Citycom.300i, Service Manual

Page: 27 / 270

2. Maintenance Information
2-6
P.C.V. system
Remove the plug from the P.C.V. drain hose.
Drain the internal deposit and reinstall the plug.
Inspection should be carried out every 2,000
kilometers.
Caution

The P.C.V. drain hose is transparent so that
the deposit is visible.

Inspection of the P.C.V drain hose should be
carried out more often in the rainy place or
under the situation of full throttle frequently.
Valve Clearance
Caution

Inspection and adjustment should be carried
out when the engine temperature is under 35
℃ .
Remove the luggage box.
Remove the cylinder head cover & the side cover.
Remove ignition timing inspection cap located on
the right cover of the engine.
Turn the camshaft bolt clockwise and let the “T”
mark on the camshaft sprocket align with the
cylinder head mark so that piston is placed at TDC
in compression stroke.
Caution
 Do not turn the bolt counterclockwise to
prevent the camshaft bolt from loosening.
Valve clearance inspection and adjustment:
Check & adjust valve clearance with thickness
gauge.
Valve clearance (IN) ： 0.10‚0.02 mm.
Valve clearance (EX) ： 0.15‚0.02 mm.
Loosen fixing nut and turn the adjustment nut for
adjustment.
Caution

Re-check the valve clearance after tightened
the fixing nut.
Special tool: Tappet adjuster
SYM-9001200-08
SYM-9001200-09
SYM-9001200-10
Special tool: Tappet adjuster wrench
SYM-9001200
P.C.V drain hose
2 bolts
Timing mark
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