honda-power-equipment hrx217hza ユーザーズマニュアル

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Replace the spark plug every 2 years or after 150 hours of use.

Recommended Spark Plug: NGK - BPR5ES

For good performance, the spark plug must be properly gapped and 
free of deposits.

1. Allow the engine to cool, 

disconnect the spark plug 
cap, and remove any dirt 
from around the spark 
plug area.

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. 

Gap: 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.

Spark plug torque: 14 ft-lb (20 N·m)

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

The spark arrester must be serviced every 100 hours to keep it 
functioning as designed.

Your lawn mower engine is not factory-equipped with a spark arrester. 
In some areas, it is illegal to operate an engine without a spark 
arrester. Check local laws and regulations. An optional USDA 
approved spark arrester is available from an authorized Honda 
servicing dealer. See 

 for part numbers.

1. Allow the engine to cool and disconnect the spark plug cap.

2. Remove the three flange bolts and the heat shield. Remove the 

setscrew and the spark arrester from the muffler.

3. Check for carbon deposits on the spark arrester and the exhaust 

port. Use a brush to remove any carbon deposits from the 
screen. Replace the screen if it is torn or damaged.

4. Installation is the reverse of removal. Tighten all hardware 

securely. 

5. Reconnect the spark plug cap.