ENGINE
MISFIRES
Incorrect spark plug gap.
Ignition cable leaking.
Weak spark
Ignition wires loose.
Water or dirt in gasoline.
Insufficient compression.
ENGINE
STOPS
Fuel tank empty.
Water, dirt, gum, etc. in gasoline.
Vapor lock (gasoline evaporating in fuel lines
due to excessive heat around engine).
Vapor lock in fuel lines or carburetor
due to incorrect fuel.
Engine scored
or
stuck due to lack of oil.
Air vent hole in the fuel tank cap plugged.
Magneto or ignition coil faulty.
ENGINE OVERHEATS
Crankcase oil level
low.
Spark timing incorrect.
Low
grade gasoline used.
Engine overloaded.
Cooling air restricted from dirt
or
debris.
Engine operated in confined space where cool-
ing air is continually recirculated.
Restricted exhaust.
Heavy load
at
low engine speed.
0
ENGINE KNOCKS
Low quality gasoline.
Engine operating under heavy load at
low
speed.
Carbon or lead deposits in cylinder head
or
on piston.
Spark timing incorrect.
Worn
or
damaged connecting rod bearing.
Worn or damaged piston pin.
ENGINE BACKFIRES THROUGH
CARBURETOR
Water or dirt in gasoline, or poor grade
gasoline.
Intake valve stuck
Valves overheated,
or
particles in combustion
chamber.
Engine cold.
ENGINE SURGES
OR
GALLOPS
Carburetor flooded.
Governor rod installed wrong, or governor out
of adjustment.
High speed jet
in
carburetor partially
restricted.
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