Honda SH125 Manual page 322

IGNITION SYSTEM
IGNITION TIMING
Start the engine and warm it up operating
temperature.
Stop the engine and remove the timing hole cap
from the right crankcase cover.
Read the instruc-
Connect the timing light to the spark plug wire.
Start the engine, let
it
idle and check the ignition
timing.
tions for timing light
opera tion.
The ignition timing is correct if the "F" mark on the
flywheel aligns with the index mark on the rear
crankcase cover at idle.
Increase the engine speed and make sure the "F"
mark begins to move.
Coat a new O-ring with engine oil and install it onto
the timing hole cap.
Install the timing hole cap and tighten it.
TORQUE: 6 N m (0.6 kgf-m, 4.4 Ibf-ft)