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PAGE 38 — MQ-WHITEMAN FS3SP CONCRETE SAW — PARTS & OPERATION MANUAL — REV. #0 (07/15/02)
FS3SP CONCRETE SAW — TROUBLESHOOTING (ENGINE)
TABLE 7. ENGINE TROUBLESHOOTING
SYMPTON POSSIBLE CAUSE SOLUTION
Difficult to start, "fuel is available, but no
SPARK at spark plug".
Spark plug bridging?
Check gap, insulation or
replace spark plug.
Carbon deposit on spark plug? Clean or replace spark plug.
Short circuit due to deficient spark plug
insulation?
Check spark plug insulation,
replace if worn.
Improper spark plug gap? Set to proper gap.
Difficult to start, "fuel is available, and
SPARK is present at the spark plug".
Console or engine ON/OFF switch is
shorted?
Check switch wiring, replace
switch.
Ignition coil defective? Replace ignition coil.
Improper spark gap, points dirtry?
Set correct spark gap and
clean points.
Condenser insulation worn or short
circuiting?
Replace condenser.
Spark plug wire broken or short circuiting?
Replace defective spark plug
wiring.
Difficult to start, "fuel is available, spark
is present and compression is normal"
Wrong fuel type?
Flush fuel system, and replace
with correct type of fuel.
Water or dust in fuel system? Flush fuel system.
Air cleaner dirty? Clean or replace air cleaner.
Difficult to start, "fuel is available, spark
is present and compression is low"
Suction/exhaust valve stuck or protruded? Re-seat valves.
Piston ring and/or cylinder worn?
Replace piston rings and or
piston.
Cylinder head and/or spark plug not
tightened properly?
Torque cylinder head bolts and
spark plug.
Head gasket and/or spark plug gasket
damaged?
Replace head and spark plug
gaskets.
No fuel present at carburetor.
Fuel not available in fuel tank? Fill with correct type of fuel.
Fuel cock does not open properly?
Apply lubricant to loosen fuel
cock lever, replace if necessary.
Fuel filter clogged? Replace fuel filter.
Fuel tank cap breather hole clogged? Clean or replace fuel tank cap.
Air in fuel line? Bleed fuel line.