Sym MB10A7-A series Service Manual page 119

7. Cylinder Head / Valve
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Valve Clearance Adjustment
Caution
Check and adjust the valve clearance
when the engine is cold (below 35°C).
Remove the tappet adjusting hole cap,
cylinder head side cover, timing-inspecting
hole cap, and ACG cap.
Rotate the crankshaft counterclockwise to
match the TDC mark "T" (piston is at TDC
position).
Valve clearance inspection / adjustment
Loosen the valve clearance adjustment nuts
and bolts located on valve rocker arm.
Measure and adjust the valve clearance with
feeler gauge.
After the valve clearance being adjusted to
standard value, hold adjustment bolt and then
tighten the locknut.
Valve clearance：0.12±0.02 mm
Caution
Make sure the valve clearance be
adjusted to the standard value.
Check the valve clearance after the
locknut is tightened.
Reconfirm the valve clearance after locking
the locknut.
Install the tappet adjusting hole cap, cylinder
head side cover, timing-inspecting hole cap,
and ACG cap.
Caution
Check the o-ring/ oil seal on the tappet
adjusting hole cap, cylinder head side
cover, timing-inspecting hole cap, and
ACG cap before installation and apply
some engine oil.
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TDC mark