Multiquip SP118 operation manual Troubleshooting Engine

	TROUBLESHOOTING (ENGINE)
	Table 8. Troubleshooting (Engine)
Symptom	Possible Problem	Solution
	Spark plug bridging?	Check gap, insulation or replace spark plug.
Difficult to start, “fuel is	Carbon deposit on spark plug?	Clean or replace spark plug.
available, but no spark at	Short circuit due to deficient spark plug insulation?	Check spark plug insulation, replace if worn.
spark plug.”
	Improper spark plug gap?	Set to proper gap.
	Ignition coil defective?	Replace ignition coil.
	ON/OFF switch is shorted?	Check switch wiring, replace switch.
Difficult to start, “fuel is
	Improper spark gap, points dirty?	Set correct spark gap and clean points.
available and spark is present
	Condenser insulation worn or short circuiting?	Replace condenser.
at the spark plug.”
	Spark plug wire broken or short circuiting?	Replace defective spark plug wiring.
	Wrong fuel type?	Flush fuel system and replace with correct type of fuel.
Difficult to start, “fuel is
	Water or dust in fuel system?	Flush fuel system.
available, spark is present and
	Air cleaner dirty?	Replace air cleaner.
compression is normal.”
	Choke open?	Close choke.
	Suction/exhaust valve stuck or protruded?	Re-seat valves.
Difficult to start, “fuel is	Piston ring and/or cylinder worn?	Replace piston rings and/or piston.
available, spark is present and	Cylinder head and/or spark plug not tightened	Torque cylinder head bolts and spark plug.
compression is low.”	properly?
	Head gasket and/or spark plug gasket damaged?	Replace head and/or spark plug gaskets.
	Fuel not available in fuel tank (tank empty)?	Fill with correct type of fuel.
No fuel present at the	Fuel filter clogged?	Replace fuel filter.
carburetor.	Fuel tank cap breather hole clogged?	Clean or replace fuel tank cap.
	Air in fuel tank?	Bleed fuel line.
	Air cleaner not clean?	Replace air cleaner.
“Weak in power,” compression	Improper fuel level in carburetor?	Check float adjustment
		Rebuild carburetor.
is proper and does not misfire.
	Defective spark plug?	Clean or replace spark plug.
	Improper spark plug gap?	Set to proper gap.
Weak in power,” compression	Water in fuel system?	Flush fuel system and replace with correct fuel type.
	Ignition coil defective?	Replace ignition coil.
is proper but misfires.
	Dirty spark plug?	Clean or replace spark plug.
	Wrong fuel type?	Flush fuel system and replace with correct fuel type.
Engine overheats.	Spark plug heat value improper?	Replace with correct type of spark plug.
	Cooling fins dirty?	Clean cooling fins.
	Governor adjusted correctly?	Adjust governor.
Rotational speed fluctuates.	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.

page 36 — SP118 Pavement Saw • operation manual — rev. #1 (05/03/12)