P25 Series of engines
6
Spark plugs
The spark plug used in the 25cc trimmer is a Cham-
pion RDJ7J (794-00055) gapped to 0.025” (0.655 mm).
See Figure 2.3.
Wear rate will vary with severity of use. If the edges
of the center electrode are rounded-off, or any other
apparent wear / damage occurs, replace the spark plug
before operating failure (no start) occurs.
Cleaning the spark plug:
NOTE:
MTD does not recommend cleaning spark
plugs.
•
Use of a wire brush may leave metal deposits
on the insulator that causes the spark plug to
short out and fail to spark.
•
Use of abrasive blast for cleaning may cause
damage to ceramic insulator or leave blast
media in the recesses of the spark plug. When
the media comes loose during engine opera-
tion, severe and non-warrantable engine dam-
age may result.
Inspection of the spark plug can provide indications of the operating condition of the engine.
•
Light tan colored deposits on insulator and electrodes is normal.
•
Dry, black deposits on the insulator and electrodes indicate an over-rich fuel / air mixture (too much fuel or
not enough air)
•
Wet, black deposits on the insulator and electrodes indicate the presence of oil in the combustion cham-
ber.
•
Heat damaged (melted electrodes / cracked insulator / metal transfer deposits) may indicate detonation.
•
A spark plug that is wet with fuel indicates that fuel is present in the combustion chamber, but it is not
being ignited.
Spark plug removal and installation
To replace a spark plug:
1.
Disconnect the spark plug wire.
2.
Push the Spark plug wire boot into the starter hous-
ing. See Figure 2.4.
3.
Remove the spark plug using a 5/8” spark plug
socket.
4.
Gap a new plug at 0.025” (0.6 mm).
5.
Install the spark plug and tighten to a torque of 160 -
220 in. lbs. (18 -25 Nm).
6.
Re-connect the spark plug wire.
7.
Test run the trimmer in a safe area before returning it to service.
Figure 2.3
Center electrode
Side electrode
Figure 2.4
Spark plug wire
! CAUTION
! CAUTION
Do not grab the spark plug wire with
pliers. Damage to the sparkplug
boot will result. A damaged spark
plug boot will weaken the spark of the spark plug.
For Parts Call 606-678-9623 or 606-561-4983
www.mymowerparts.com
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