Honda HRX217HZUA, Owner'S Manual

13

Spark Plug

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

Recommended Spark Plug:

 NGK - BPR5ES

NOTICE

An incorrect spark plug can cause engine damage.

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 21mm 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:

 0.7 ~ 0.8mm

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 21mm 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: 

20 N·m

NOTICE

A loose spark plug can overheat and damage the engine.

Overtightening the spark plug can damage the threads in the
cylinder head.

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

Spark Arrester (optional part)

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

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.

Charging the Battery

The lawn mower engine has an internal charging system. Under
normal mowing usage it is not necessary to charge or maintain the
battery. 

If the mower fails to start or has been stored for an extended period: 

 • Start the lawn mower using the recoil starter manually for at least

one mowing session. This should charge the battery sufficiently to
use the electric starter.

 • If the electric starter does not operate (after manually starting for

one mowing session), check the 3 Amp and 40 Amp fuses (shown
on 

page 14

)

 • If the electric starter still does not operate, take the lawn mower to

an authorised Honda servicing dealer

SPARK PLUG

SPARK 
PLUG 
CAP

0.7 ~ 0.8 mm

SEALING
WASHER

SETSCREW

SPARK ARRESTER

FLANGE 
BOLT (3)

HEAT SHIELD