Tecumseh TH139SP(HSK600-870) - Manual (Page 14)

Page 12 Two-Cycle Engine • Horizontal/Vertical Crankshaft • Air-Cooled 181-807-14
D. Adjustments
DO NOT make any engine adjustments. Factory settings
are satisfactory for most conditions. If adjustments are
needed, contact your Authorized TecumsehPower
Servicing Dealer.
E. Muffler and Cylinder Exhaust Ports
The muffler and cylinder exhaust ports require cleaning
after every 75 to 100 hours of operation.
NOTE
For this maintenance procedure it is recommended that
the engine be taken to an Authorized TecumsehPower
Servicing Dealer.
F. 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
electrodes are:
• Pitted
• Burned
• Fouled with Deposits
4. Check electrode gap with wire feeler gauge and set
gap to—.030 in. (0.76 mm) if necessary. See Figure 19.
5. Install spark plug and tighten securely.
NOTE
A resistor spark plug must be used for replacement. Contact
your Authorized TecumsehPower Servicing Dealer for a
genuine replacement Resistor Spark Plug.
G. Removing Snow from Engine
After each use remove snow from the following areas:
• Fuel Fill Cap
• Recoil Starter Screen
• Control Lever
NOTES
See equipment manufacturer’s instructions for proper
location of fuel fill cap and control lever.
Removing snow will ease operation of the recoil starter rope
and reduce the risk of water contamination when opening
fuel fill cap. See Figure 20.
For more information about recoil starters, see "B. Engines
with Recoil Starters" instructions on page 8.
Figure 19. Resistor Spark Plug
Figure 20. Recoil Starter Debris Areas
1. .030 in. (0.76 mm) Gap
2. Electrodes
3. Porcelain
1
2
3