MULTIQUIP CA4HC Whiteman Series Operation Manual page 69

Symptom
Difficult to start, fuel is available, but no spark
at spark plug.
Difficult to start, fuel is available, and spark is
present at the spark plug.
Difficult to start, fuel is available, spark is
present and compression is normal.
Difficult to start, fuel is available, spark is
present and compression is low.
No fuel present at carburetor.
CA4HM WALK-BEHIND TROWEL — OPERATION MANUAL — REV. #3 (10/28/10) — PAGE 33
Troubleshooting (Engine)
Possible Problem
Spark plug bridging?
Carbon deposit on spark plug?
Short circuit due to deficient spark plug
insulation?
Improper spark plug gap?
Fuel reaching carburetor?
Water in fuel tank?
Fuel filter clogged?
Stuck carburetor?
Spark plug is red?
Spark plug is bluish white?
No spark present at tip of spark plug?
No oil?
Oil pressure alarm lamp blinks upon starting?
(if applicable)
ON/OFF switch is shorted?
Ignition coil defective?
Improper spark gap, points dirty?
Condenser insulation worn or short circuiting? Replace condenser.
Spark plug wire broken or short circuiting?
Wrong fuel type?
Water or dust in fuel system?
Air cleaner dirty?
Choke open?
Suction/exhaust valve stuck or protruded?
Piston ring and/or cylinder worn?
Cylinder head and/or spark plug not tightened
properly?
Head gasket and/or spark plug gasket
damaged?
No fuel in fuel tank?
Fuel cock does not open properly?
Fuel filter/lines clogged?
Fuel tank cap breather hole clogged?
Air in fuel line?
TROUBLESHOOTING
Solution
Check gap, insulation or replace spark plug.
Clean or replace spark plug.
Check spark plug insulation, replace if worn.
Set to proper gap.
Check fuel line.
Flush or replace fuel tank.
Replace fuel filter.
Check float mechanism.
Check transistor ignition unit.
If insufficient compression, repair or replace
engine. If injected air leaking, correct leak. If
carburetor jets clogged, clean carburetor.
Check transistor ignition unit is broken, and
replace defective unit. Check if voltage cord
cracked or broken and replace. Check if
spark plug if fouled and replace.
Add oil as required.
Check automatic shutdown circuit, "oil
sensor". (if applicable)
Check switch wiring, replace switch.
Replace ignition coil.
Set correct spark gap and clean points.
Replace defective spark plug wiring.
Flush fuel system, and replace with correct
type of fuel.
Flush fuel system.
Clean or replace air cleaner.
Close choke.
Reseat valves.
Replace piston rings and/or piston.
Torque cylinder head bolts and spark plug.
Replace head and spark plug gaskets.
Fill with correct type of fuel.
Apply lubricant to loosen fuel cock lever,
replace if necessary.
Replace fuel filter.
Clean or replace fuel tank cap.
Bleed fuel line.