Page S-5
Repair and Service Manual
B
B
TROUBLESHOOTING
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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. Set air/fuel mixture
screw to 1.5 turns out from the lightly seat-
ed position (No adjustment on CARB?EPA
certified engines).
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. Call your tech
rep. for more information
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
Condition Possible Cause Correction
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