Product Manual

Page 21 of 35
⚠CAUTION
The manufacturer of the equipment on which this engine is installed specifies the top speed at which
the engine will be operated. Do not exceed this speed.
How to Replace the Spark Plug
If the engine has been running, let it cool before servicing
the spark plug.
For good performance, the spark plug must be properly
gapped and free of deposits.
1. Disconnect the spark plug cap, and remove any
dirt from around the spark plug area.
2. Remove the spark plug with a 13/16-inch spark
plug wrench.
3. Visually inspect the spark plug. Replace it if
damaged or badly fouled, if the sealing washer
is in poor condition, or if the electrode is worn.
4. Measure the spark plug electrode gap with a
wire-type feeler gauge. Correct the gap, if
necessary, by carefully bending the side electrode.
The gap should be: 0.7-0.8 mm (0.028-0.031 in)
5. Install the spark plug carefully, by hand, to
avoid cross-threading.
6. After the spark plug is seated, tighten with a
13/16-inch spark plug wrench to compress the
sealing washer.
When installing a new spark plug, tighten 1/2 turn after the spark plug seats to compress the
washer.
When reinstalling the original spark plug, tighten 1/8 1/4 turn after the spark plug seats to
compress the washer.
⚠CAUTION
A loose spark plug can overheat and damage the engine. Over tightening the spark plug can
damage the threads in the cylinder head.
7. Attach the spark plug cap to the spark plug.
Inspect Muffler and Spark Arrester
⚠WARNING
Running engines produce heat. Engine parts, especially muffler, become extremely hot.