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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 inside priming bulb.
PAGE 26 — DSGPULW DUOSCREED • OPERATION MANUAL — REV. #8 (06/12/23)
TROUBLESHOOTING ( ENGINE )
Table 5. Troubleshooting (Engine)
Possible Problem
Spark plug bridging?
Carbon deposit on spark plug?
Short circuit due to deficient spark plug
insulation?
Improper spark plug gap?
Spark plug is red?
Spark plug is bluish white?
No spark present at tip of spark plug?
No oil?
ON/OFF switch is shorted?
Ignition coil defective?
Improper spark gap, points dirty?
Condenser insulation worn or short
circuiting?
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 filter/lines clogged?
Fuel tank cap breather hole clogged?
Air in fuel line?
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 transistor ignition unit.
If insufficient compression, repair or
replace engine. If injected air leaking,
correct leak. If carburetor jets clogged,
clean carburetor.
Check if transistor ignition unit is
broken, and replace defective unit.
Check if voltage cord cracked or
broken and replace. Check if spark
plug is fouled and replace.
Add oil as required.
Check switch wiring, replace switch.
Replace ignition coil.
Set correct spark gap and clean points.
Replace condenser.
Replace defective spark plug wiring.
Flush fuel system, 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.
Replace fuel filter.
Clean or replace fuel tank cap.
Bleed fuel line.
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