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Troubleshooting (Engine)
Symptom
Possible Problem
Solution
Difficult to start, fuel is available, but
no spark at spark plug.
Combo lever in incorrect position?
Make sure combo lever is in start
position.
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.
Fuel reaching carburetor?
Check fuel line.
Water in fuel tank?
Flush or replace fuel tank.
Fuel filter clogged?
Replace fuel filter.
Stuck carburetor?
Check float mechanism.
Spark plug is red?
Check transistor ignition unit.
Spark plug is bluish white?
If insufficient compression, repair or
replace engine. If injected air leaking,
correct leak. If carburetor jets clogged,
clean carburetor.
No spark present at tip of spark plug?
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.
No oil?
Add oil as required.
Difficult to start, fuel is available, and
spark is present at the spark plug.
ON/OFF switch is shorted?
Check switch wiring, replace switch.
Ignition coil defective?
Replace ignition coil.
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, replace with
correct type of fuel.
Water or dust in fuel system?
Flush fuel system.
Air cleaner dirty?
Clean or 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?
Reseat 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.
No fuel 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/lines clogged?
Replace fuel filter.
Fuel tank cap breather hole clogged? Clean or replace fuel tank cap.
Air in fuel line?
Bleed fuel line.
