MAINTENANCE
TROUBLE SHOOTING
1. Each Day
Following is a list of troubles which may occur through
a. Check fuel supply and oil level in crankcase.
average use and normal wear.
Add oil only is needed to keep the level between
the marks on the dipstick. (Use type of oil
1. Hard Starting
specified on engine instruction plate.)
a. Faulty Ignition
(1) Loose or grounded high tension or
b. Clean oil and dirt from external surfaces of
breaker point leads.
power unit.
(2) Improper breaker point gap.
2. Every 25 Operating Hours
(3) Defective breaker points.
a. Change oil in crankcase. (Change more often
(4) Faulty spark plug or improper gal).
under extremely dusty conditions. Be sure there
(5) Faulty condenser or coil.
are no air leaks at gasket. Joints between air
(6) Incorrect spark timing.
cleaner, carburetor and cylinder block.
b. Faulty Carburetion
b. Remove. Clean and replace sediment bow:
(1) Gas not getting to carburetor.
c. Wipe oil and dirt from engine block, spark plug
(a) Dirt or gum in fuel line.
and oil fill.
(b) Faulty fuel pump.
d. Remove and clean dry air cleaner.
(2) Dirty carburetor.
3. Every 100 Operating Hours.
(3) Carburetor improperly adjusted.
In addition to regular 25 hour inspection and
(4) Defective fuel pump.
maintenance:
c. Compression loss.
a. Check spark plug and reset gap to .025. Set
(1) Valves leaking or sticking.
radio shielded spark plugs at .020.
(2) Rings worn.
b. Remove, clean and replace sediment bowl.
(3) Head gasket leaking.
2. Overheating
4. Every 500 Operating Hours
Perform regular 25, and 100, hour service an(d in
a. Lack of cool air
addition:
b. Dirty air intake screen, shroud or cooling fins.
a. Check ignition timing.
c. Improper fuel.
d. Fuel mixture too lean.
b. Check valve tappet clearance and clean carbon
e. Improper ignition timing.
from valve stems.
f. Excessive amount of oil in crankcase.
c. Remove head and clean out deposits.
3. Backfiring
d. Check magneto.
a. Fuel mixture too lean.
e. Clean carburetor.
b. Sticky intake valve.
c. Improper ignition timing.
f. Check engine compression
4. Occasional Missing Under Load
INSTRUCTIONS FOR STORING
a. Spark plug gap too wide.
b. Improper carburetor setting or lack of fuel.
If engine is to be out of service for a considerable
length of time the following is recommended:
c. Wrong type spark plug.
d. Improper ignition timing.
a. Drain oil from crankcase while engine is still hot
and flush with clean, light oil. Refill crankcase.
e. Partially fouled spark plug.
f. Pitted breaker points.
b.. Drain fuel tank and carburetor.
5. Knocking
c. Remove, clean and replace sediment bowl.
a. Fuel octane rating too low.
d. Clean exterior of engine.
b. Overheated engine.
c. Improper ignition timing.
e. Spread a light film of oil over any exposed
d. Loose connecting rod.
surfaces of engine subject to corrosion.
e. Excessive carbon in combustion chamber.
f. Pour tablespoon of oil into spark plug hole crank
f. Lack of lubrication.
engine slowly by hand and replace spark plug.
g. Fuel mixture too lean.
g.Store in dry place.
h. Excessive camshaft end clearance.
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