Honda HS621 Bedienungsanleitung Seite 42

5. Measure the plug gap with a feeler gauge.
Correct as necessary by carefully bending the side electrode.
The gap should be:
0.70 0.80 mm (0.028 0.031 in) −
Recommended spark plug: BPR5ES (NGK)
0.70 0.80 mm (0.028 0.031 in) −
6. Make sure that the sealing washer is in good condition and thread
the spark plug in by hand to prevent cross-threading.
7. After the spark plug is seated, tighten with a spark plug wrench to
compress the washer.
If installing a new spark plug, tighten 1/2 turn after the spark plug seats
to compress the washer. If reinstalling a used spark plug, tighten 1/8 to
1/4 turn after the spark plug seats.
Use only the recommended spark plugs or equivalent plugs. Spark
plugs which have an improper heat range may cause engine
damage.
The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and may damage the
engine.
−
W16EPR-U (DENSO)
−
SIDE ELECTRODE
SEALING WASHER
39