honda-automobiles hrc216hxa User Manual

2. Remove the spark plug with a 

13/16 in (21 mm) spark plug 
wrench. 

3. Inspect the spark plug. 

Replace it if the electrodes are 
worn, or if the insulator is 
cracked or chipped.

4. Measure the spark plug 

electrode gap with a suitable 
gauge. The gap should be 0.028 ~ 0.031 in (0.7 ~ 0.8 mm). Correct 
the gap, if necessary, by carefully bending the side electrode.

5. Install the spark plug carefully, 

by hand, to avoid 
cross-threading.

6. After the spark plug seats, 

tighten with a 13/16 in (21 mm) 
spark plug wrench to compress 
the washer.

If reinstalling the old spark plug, 
tighten 1/8 to 1/4 turn after the 
spark plug seats.

If installing a new spark plug, 
tighten 1/2 turn after the spark 
plug seats to compress the washer.

7. Install the spark plug cap on the spark plug.