Engine Fails To Start - Toro AC-1 Service Manual

When difficulties occur, be sure to check for simple
c '
causes which, at first, may seem too obvious to be
considered. A starting problem, for example, could be
caused by an empty fuel tank.
The following table lists some common causes of
operating troubles and the possible causes and
remedies.
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Engine Fails To Start
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;Possible Cause
Ignition switch in STOP (0) position
Out of fuel or water in fuel
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Dirty or plugged air filter
Loose spark plug lead wire
Fouled, improperly gapped or broken spark plug
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Plugged fuel tank cap vent
Plugged or waterlogged fuel filter
Improperly adjusted carburetor
Plugged muffler
Faulty primer or primer/fuel lines improperly installed
Plugged fuel line
Faulty carburetor diaphragm
Plugged spark arrester screen
Faulty fuel pump diaphragm
Plugged carburetor/fuel pump passages
Incorrect air gap between flywheel & ignition module
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Faulty ignition module
Low compression
Rocker arm to valve clearance is out of adjustment
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Remedy
Place switch in RUN (I) position
Drain tank and blow out fuel lines to remove water
Refuel tank with fresh fuel
Clean or replace air filter
Reconnect lead wire
Clean or replace spark plug; set gap to 0.025 inch
(0.635 mm)
Clean fuel tank cap vent
Replace fuel filter
Adjust carburetor
Clean or replace muffler
Correctly install primer/fuel lines or replace primer
Blow out fuel line
Replace diaphragm
Clean or replace spark arrester screen
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Replace pump diaphragm
Clean out passages
Set ignition module air gap to
0.008-0.01 2 in (0.201
-0.305
mm)
Replace ignition module
Replace piston rings or cylinder
Adjust rocker arm to valve clearance
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