FAULT TESTING
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
133
ERRATIC, SURGING, OR SUDDEN
CHANGE IN GOVERNED SPEED
Damaged governor spring Replace
Problem with adjustment of accelerator,
governor and carburetor linkage
Adjust
Bent governor arm Repair or replace
Bent governor shaft Replace
Governor failure within the rear axle Repair
FUEL ACCUMULATION IN
THE CRANKCASE
FUEL DISTRIBUTION
Dirty Carburetor Clean or replace.
Clogged carburetor vents Remove carburetor and clean with solvent
Carburetor float sticking Disassemble and correct per the service
manual
Faulty fuel pump Check for correct output. Verify fuel is not
returning through the pulse line. Clean
vent screen.
Faulty accelerator adjustment/function Correct per the service manual
Dirty or restricted air filter Replace and clean air box
High pressure in the fuel system Check fuel cap for venting. Make sure car-
buretor vent tubes are venting
Over choking or faulty choke setting Instruct operator or adjust to limit choke to
3/4 blade travel
Wrong carburetor jet for the altitude Verify per the altitude chart.
MECHANICAL
Faulty Ignition system Check ignition output per the service man-
ual.
Low or unbalanced compression Perform compression or leak down test.
Refer to the service manual for the specifi-
cation.
Poor valve sealing Verify by compression or leak down test
OPERATION AND APPLICATION
Engine not reaching full temperature Increase run time intervals to build higher
cylinder temperature
Continuous use at 1/4 throttle or less at low
engine speed
Instruct operator
Wide open throttle cranking Instruct operator per operator’s manual
Long and continuous down hill use Down hill use without the accelerator par-
tially pressed will flood the cylinder with
fuel due to no ignition present
Poor fuel quality Do not use old fuel. Add stabilizer for ex-
tended storage. Have fuel tested for con-
taminants.
Use of summer blend fuel in the winter Correct with fresh fuel
Condition Possible Cause Correction
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