Craftsman 143.991200 Specifications download pdf (Page 64)

ENGINE OPERATION PROBLEMS

SURGES OR RUNS UNEVENLY

Fuel cap vent obstructedExcessive engine loading

OVERHEATS

ENGINE KNOCKS

Associated equipment loose or

improperly adjusted

Check for excessive carbon in

combustion chamber

Loose flywheel examine key, key way

and proper flywheel nut torque

Ignition timing or

incorrect spark plug

Loose or worn connecting rod

Worn cylinder

Low oil level or wrong viscosity oil

Cooling air flow obstructed or clogged

cooling fins

Carburetor improperly adjusted or

improper RPM setting*

Ignition timing or

incorrect spark plug

Carbon in the combustion chamber

Dirty carburetor or air filter

Carburetor improperly adjusted

Governor sticking, binding or improper

RPM setting

Carburetor linkage, shafts or shutters

sticking or binding

Intermittent spark, check ignition or

incorrect spark plug

Oil level above full

Wrong viscosity oil

Engine cooling fins dirty causing

overheating

Breather damaged, dirty or improperly

installed

Excessive engine speed

Damaged gaskets, seals or "O" rings

EXCESSIVE OIL CONSUMPTION

Valve guides worn excessively

Worn or glazed cylinder

Piston rings worn

Lean carb setting causing overheating

(adjustable carb)

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Craftsman 143.991200 Specifications Page 64

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