Product Manual

3. Maintaining the spark plug
The recommended type of spark plug is NHSP LD P6RTCU.
To ensure normal operation of the engine, the spark plug should
have a correct gap and should remain free of carbon deposits.
1) Remove the plug cap.
The muffler may be very hot if the engine is still running. Take care
not to touch the muffler.
2) Check the spark plug visually. Discard the spark plug if it is
obviously worn out or the insulation ring on it is broken or cracked.
Clean the spark plug with a brush when put it back in place.
3) Check the plug gap with a feeler gauge.
Vary the gap by moving the side electrode.
Normal plug gap: 0.70~0.80mm
4) Check the plug O-ring for normal condition. Screw it in with the
plug wrench to protect the plug thread.
NOTE:
gIn the case of screwing in a new spark plug, tighten it by an
additional 1/2 screw turn after the plug reaches and pushes on the
O-ring, while in the case of a used spark plug, an additional 1/2~1/4