j. Weak coil or condenser.
6. Operating Erratically
a. Clogged fuel line.
k. Loose ignition system connections.
b. Water in fuel.
7. Engine Will Not Idle
a. Improper carburetor idling adjustment.
c. Faulty choke control.
b. Carburetor jets clogged.
d. Improper fuel mixture.
c. Spark plug gap too small.
e. Loose ignition system connections.
d. Leaking carburetor or manifold gaskets.
f. Air leaks in manifold or carburetor connections.
e. Sticking or leaking valves.
g. Carburetor jets clogged.
f. Weak coil or condenser.
h. Leaking carburetor or manifold gaskets.
i. Sticking or leaking valves.
SERVICE PROCEDURE
possible, discuss with the engine owner the type of
Lack of vacuum would indicate a faulty breather,
application and the length of time engine has been in
excessive engine blowby, leaky valves or worn oil seals.
service.
See Reconditioning Sections.
Inspect engine in owner's presence and try to
determine, as nearly as possible, the extent of repairs.
When an engine has been reconditioned, the owner
has a right to expect the same performance he would
normally receive from a new engine. It is impossible to
over-emphasize the importance of good service. Failure
in providing quality service discourages new and repeat
sales.
Repair and maintenance of K141 engines will not be
difficult if the owner or repairman will thoroughly
familiarize himself with the following instructions.
Compression and crankcase vacuum checks should be
AIR CLEANER
taken when engine is losing power or running unevenly
and when carburetion and ignition adjustments do not
The air cleaner is one of the most important parts of the
remedy the situation.
engine from the standpoint of engine life. If dirty air
COMPRESSION CHECK
gets into the engine, it can wear out a set of piston rings
within a few operating hours.
After removing spark plug lead spin flywheel against
compression.
If engine has adequate compression,
flywheel will "bounce" back. To check this on engines
equipped with Automatic Compression Release, the
flywheel must be spun in reverse direction.
To accurately check compression a commercial
compression testing gage should be used in the manner
Dry paper element type cleaners can be cleaned by
indicated by the manufacturer. The engine should be
removing the element and tapping lightly, causing loose
"motored" to 1000 R.P.M, which should give a reading of
dirt to fall off. The element Should be replaced if dirt
110 to 120 psi for an engine in top mechanical condition.
does not drop off easily.
When this figure falls below 100 psi. it indicates leaking
rings or valves; or deposits in the combustion chamber
which limit the charge entering the combustion chamber.
See Reconditioning Section.
CRANKCASE VACUUM CHECK
The crankcase breather maintains a partial vacuum in
the crankcase. It may be checked with a water U-tube
manometer or vacuum gage. Connect meter to crankcase
through a tube and cork inserted at oil filler hole. A
vacuum of 5 to 10 inches water column or 1/2 to 1"
mercury should be present when engine is running.
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