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Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
CONDITION
POOR MIDRANGE OR
HIGH SPEED PERFOR-
MANCE
ENGINE OVERHEATING
REPEATED SPARK PLUG
FOULING
EXCESSIVE EXHAUST
SMOKE
BACKFIRING
ERRATIC, SURGING, OR
SUDDEN CHANGE IN
GOVERNED SPEED
653045
POSSIBLE CAUSE
Spark plug fouled
Dirty air filter
Brake(s) dragging
Damaged or plugged muffler
Inadequate oil supply
Cooling fan clogged
Wrong spark plug type
Wrong spark plug gap
Faulty ignition system
Poor quality gasoline
Air leak allowing dirt to enter system Repair or replace air intake hose
Wrong oil weight
Dirty oil
Crankcase overfilled with oil
Piston rings worn or broken
Valves worn
Valve seals or valve guides worn
Faulty plug wires
Faulty ignition system
Governor bracket spring dragging
Problem with adjustment of accelera-
tor, governor linkage
Bent governor arm
Bent governor shaft
Governor failure within the rear axle
Fig. 2 Powertrain Performance Troubleshooting (Continued)
Repair and Service Manual
FAULT TESTING
CORRECTION
Clean or replace
Clean or replace
Perform brake maintenance
Clean, repair or replace
Check oil system, inspect oil pump, change oil, fill to correct
level
Clean
Replace with correct spark plug. See GENERAL SPECIFICA-
TIONS.
Replace with correct spark plug. See GENERAL SPECIFICA-
TIONS.
Check and repair if required
Use correct fuel, check bulk storage tank for proper storage
and handling. See GENERAL SPECIFICATIONS.
Replace with recommended oil. See GENERAL SPECIFICA-
TIONS.
Replace. See GENERAL SPECIFICATIONS.
Drain and fill to recommended level. See GENERAL SPECIFI-
CATIONS.
Replace
Replace
Replace
Replace
Check and repair if required
Clean and/or oil
Adjust
Repair or replace
Replace
Repair
B
145
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