Sym PA12B - Valve Clearance Adjustment

7. Cylinder Head / Valve
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Valve Clearance Adjustment
7-17
Caution
z Inspect and adjust the valve clearance
when the engine is cool (under 35°C).
Remove the tappet adjusting hole cap.
Remove the cylinder head side cover.
Use a T type wrench to rotate the crankshaft
clockwise and align the “T” mark on the
flywheel with the index mark on the left
crankcase cover and the timing mark on the
sprocket with the index mark on the cylinder
head (piston is at top dead center on the
compression stroke).
Valve clearance inspection / adjustment
Inspect and adjust valve clearance with
thickness gauge.
Valve clearance：IN 0.05±0.02 mm
EX 0.05±0.02 mm
Loosen the fixing nut and rotate the adjusting
bolt to adjust valve clearance.
Fasten the adjusting bolt and tighten the fixing
nut when the standard value is reached.
Caution
z Confirm the valve clearance reach the
standard value when the fixing nut is
tightened.
Install the tappet adjusting hole cap, cylinder
head side cover, timing inspecting hole cap
and ACG cap.
Caution
z Check for any damage on the O ring and
coat it with engine oil before installing the
tappet adjusting hole cap, cylinder head
side cover, timing inspecting hole cap and
ACG cap.
TDC mark