V4.0
302cc OHV Winter Gas Engine
8717621
Visit www.princessauto.com for more information
11
4. Inspect the spark plug. Replace it if damaged, badly fouled, the sealing washer is in poor condition or the electrode is worn.
5. Check the gap (Fig. 8-2) with a spark plug gauge/gapper or feeler gauge (Fig. 8-3). If necessary, reset the gap
(See Specifications).
6. Install the spark plug carefully by hand to avoid cross threading.
7. Tighten the spark plug.
a. When installing a new spark plug, tighten 1/2 turn after the spark plug seats to compress the washer.
b. When reinstalling the original spark plug, tighten 1/8 to 1/4 turn after the spark plug seats to compress the washer.
8. Attach the spark plug cap to the spark plug.
IMPORTANT!
In some areas, local law requires using a resistor spark plug to suppress ignition signals. If this
engine was originally equipped with a resistor spark plug, use the same type for replacement.
INSPECT THE MUFFLER
WARNING! Running engines produce heat. Engine parts, especially the
muffler, become extremely hot. Severe burns can occur on contact.
Combustible debris, such as leaves, grass, brush, etc. can catch fire.
1. Allow the muffler (Fig. 9-1), the engine cylinder and fins to cool
before touching.
2. Remove any accumulated debris from the muffler area and cylinder area.
3. Clean muffler cover of debris to allow air flow.
EMISSION CONTROL SYSTEM INFORMATION
The combustion process produces carbon monoxide, hydrocarbons and oxides of nitrogen. Control of these
emissions is very important for personal and environmental health.
The following instructions must be followed in order to keep the emissions from your engine within Canadian
emission standards.
1. Do not remove or alter any part of the intake, fuel or exhaust systems.
2. Do not alter or bypass the governor linkage or speed-adjusting mechanism to cause the engine to operate outside
its design specifications.
PROBLEMS THAT MAY AFFECT EMISSIONS
If you are aware of any of the following symptoms, have your engine inspected and repaired by a qualified technician.
1. Hard starting or stalling after starting.
2. Rough idle.
3. Misfiring or backfiring under load.
4. Afterburning (backfiring)
5. Black exhaust smoke or high fuel consumption
REPLACEMENT PARTS
The emission control systems on your engine were designed, built and certified to conform to Canadian emission
regulations. The use of genuine parts is recommended whenever maintenance is done to the engine. Genuine
replacement parts are manufactured to the same standards as the original parts. Using replacement parts that are not of
the original design and quality may impair the effectiveness of your emission control system.
It is the responsibility of the manufacturer of an aftermarket part to certify that use of the part will not result in a failure
of the engine to comply with emission regulations.
Fig. 11
fig. 9
9-1
