Page 14 Four-Cycle Engine • Horizontal Crankshaft • Air-Cooled 181-789-14
B. Removing Debris from Engine
Before each use, remove grass clippings, dirt and debris
from the following areas:
• Levers and Linkage
• Cooling Fins
• Air Intake Screen
• Guards
Removing debris will facilitate adequate cooling, correct
engine speed and reduce the risk of fire. See Figure 33.
C. Spark Plug
Check spark plug yearly or every 100 operating hours.
1. Clean area around spark plug.
2. Remove and inspect spark plug.
3. Replace spark plug if porcelain is cracked or if elec-
trodes are:
•Pitted
• Burned
• Fouled with deposits
4. Check electrode gap with wire feeler gauge and set
gap to .030 (0.76mm) if necessary. See Figure 34.
5. Install spark plug and tighten securely.
NOTE
A resistor spark plug must be used for replacement. Contact
your Authorized Tecumseh Servicing Dealer for a
Tecumseh Resistor Spark Plug.
D. Cleaning/Replacing Air Cleaner
Your engine has an air cleaner which helps prevent
premature engine wear and failure. NEVER run engine
without complete air cleaner installed on engine. Your air
cleaner periodically needs to be cleaned or replaced. To do
this, you first need to determine the type of air cleaner on
your engine. Your engine will be equipped with one of the
following air cleaners; Type A or B. Follow instructions for
the air cleaner type that resembles your model.
NOTE
Contact your Authorized Tecumseh Servicing Dealer for
Tecumseh Air Cleaner.
Figure 33. Debris Removal Areas
Figure 34. Resistor Spark Plug
1. Levers and Linkage
2. Air Intake Screen
3. Muffler Guard
4. Cooling Fins
Formula Compact Models
Formula Standard Models
1
4
2
3
1
2
4
2
1
2
1. .030 (0.76 mm) Gap
2. Electrodes
3. Porcelain
1
2
3
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