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14
Proper spark plug clearance ensures the engine’s normal running under no deposit around the
spark plug. Warning Be careful not to touch the muffler during or just after running the
engine.
1. Remove the spark plug cap.
2. Clear away dirt around the spark plug base.
3. Dismantle the spark plug with a spark plug
wrench.
4. Clean with a steel brush. If the insulator is
damaged, replace the spark plug instead.
5. Measure the spark plug clearance with a
feeler. The clearance should be 0.7~0.8mm.
If adjustment is necessary, bend the side
electrode carefully.
6. Check if the spark plug gasket is in good
conditions, or replace with a new one. Screw
on the spark plug to the bottom first by hand
and then screw in by a spark plug wrench. If
a new spark plug is used, twist 1/2 more
turns after impacting the gasket, if reinstall
the original one, just twist 1/8-1/4 more
turns.
CAUTION:
● The spark plug must be tightened securely, or it may become very hot to damage the
engine.
● Only use recommended spark plug or the equivalent. Incorrect heat range of the spark
plug may damage the engine.
CARBURETOR IDLING
ADJUSTMENT
1. Start and preheat the engine until arriving
at the normal working temperature.
2. Obtain standard idling by adjusting the
throttle fixing screw under the engine’s
idling. Standard idling: 1700±150rpm.
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