Lyda 203D, Owner'S Manual

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However, the idling speed maybe performed by the
owner as a part of the usual maintenance routine.
Idle speed adjustment
1. Start the engine and warm it up for a few minutes
at nearly 1,000 to 2,000 r/min. Sometimes rev the
engine to 4,000 to 5,000 r/min. The engine is earn
when it quickly responds to the throttle.
2. Connect the tachometer and set the idle to the
specified idling speed by adjusting the throttle
stop screw. Turn the screw into increase engine
speed, and out to decrease engine speed.
Valve clearance adjustment
The proper valve clearance changes with use,
leading to incorrect/air supply or engine noise.
To prevent this, the valve clearance must be
adjusted periodically. This adjustment however,
should be left to a professional service technician.
Cam chin adjustment
The cam chain will loosen with use, resulting in
improper valve timing and engine noise. To
prevent this, the cam chain tensioned must be
adjusted regularly. This adjustment should be
left to your dealer.