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PAGE 36 — SP118 PAVEMENT SAW • OPERATION MANUAL — REV. #1 (05/03/12)
TROUBLESHOOTING (ENGINE)
Table 8. Troubleshooting (Engine)
Symptom Possible Problem 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.
Ignition coil defective? Replace ignition coil.
Difficult to start, “fuel is
available and spark is present
at the spark plug.”
ON/OFF switch is shorted? Check switch wiring, replace switch.
Improper spark gap, points dirty? 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? Replace air cleaner.
Choke open? Close choke.
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/or spark plug gaskets.
No fuel present at the
carburetor.
Fuel not available in fuel tank (tank empty)? Fill with correct type of fuel.
Fuel filter clogged? Replace fuel filter.
Fuel tank cap breather hole clogged? Clean or replace fuel tank cap.
Air in fuel tank? Bleed fuel line.
“Weak in power,” compression
is proper and does not misfire.
Air cleaner not clean? Replace air cleaner.
Improper fuel level in carburetor?
Check float adjustment
Rebuild carburetor.
Defective spark plug? Clean or replace spark plug.
Improper spark plug gap? Set to proper gap.
Weak in power,” compression
is proper but misfires.
Water in fuel system? Flush fuel system and replace with correct fuel type.
Ignition coil defective? Replace ignition coil.
Dirty spark plug? Clean or replace spark plug.
Engine overheats.
Wrong fuel type? Flush fuel system and replace with correct fuel type.
Spark plug heat value improper? Replace with correct type of spark plug.
Cooling fins dirty? Clean cooling fins.
Rotational speed fluctuates.
Governor adjusted correctly? Adjust governor.
Governor spring defective or missing? Replace governor spring.
Fuel flow restricted? Check entire fuel system for leaks or clogs.
Recoil starter malfunction?
Recoil mechanism clogged with dust and dirt? Clean recoil assembly with soap and water.
Spiral spring loose? Replace spiral spring.