Shindaiwa 502s - Manual (Page 18)

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Troubleshooting Guide
Does the engine crank?
Good compression?
Does the tank contain
fresh fuel of the proper
grade?
Is fuel visible and mov-
ing in the return line
when priming?
Is there spark at
the spark plug wire
terminal?
Check the spark plug.
The plug is damaged internally or of the
wrong size.
What To Check Possible Cause Remedy
ENGINE DOES NOT START
Faulty recoil starter.
Fluid in the crankcase.
Internal damage.
Loose spark plug.
Excess wear on cylinder, piston, rings.
Fuel incorrect, stale, or contaminated;
mixture incorrect.
Check for clogged fuel filter and/or vent.
The ignition switch is in “O” (OFF)
position.
Shorted ignition ground.
Faulty ignition unit.
If the plug is wet, excess fuel may be in
the cylinder.
The plug is fouled or improperly gapped.
Consult with an authorized servicing dealer.
Tighten and re-test.
Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline
with a pump octane of 87 or higher mixed
with 50:1 Shindaiwa Premium 2-cycle
mixing oil or with an equivalent high
quality 2-cycle mixing oil.
Replace fuel filter or vent as required.
Restart.
Move switch to “I” (ON) position and restart.
Consult with an authorized servicing dealer.
Crank the engine with the plug
removed, reinstall the plug, and restart.
Clean and regap the plug to 0.6mm-
0.7mm. Restart.
Replace the plug. Check the Specifications
page for the correct spark plug. Restart.
Is the engine overheating?
Engine is rough at all speeds.
May also have black smoke
and/or unburned fuel at the
exhaust.
What To Check Possible Cause Remedy
LOW POWER OUTPUT
Engine is knocking.
Operator is overworking the unit.
Carburetor mixture is too lean.
Improper fuel ratio.
Fan, fan cover, cylinder fins dirty or
damaged.
Carbon deposits on the piston or in the
muffler.
Overheating condition
Improper fuel
Carbon deposits in the combustion chamber.
Clogged air cleaner element.
Loose or damaged spark plug.
Air leakage or clogged fuel line.
Water in the fuel.
Piston seizure.
Faulty carburetor and/or diaphragm.
Consult with an authorized servicing dealer.
Cut at a slower rate.
Consult with an authorized servicing dealer.
Refill with fresh, clean unleaded gasoline
with a pump octane of 87 or higher mixed
with 50:1 Shindaiwa Premium 2-cycle
mixing oil or with an equivalent high
quality 2-cycle mixing oil.
Clean, repair or replace as necessary.
Consult with an authorized servicing dealer.
Clean or replace the air filter.
Tighten or replace the plug. Check the
Specifications page for the correct spark
plug. Restart.
Repair or replace fuel filter and/or fuel line.
Refill with fresh fuel/oil mixture.
Consult with an authorized servicing dealer.
See above.
Check fuel octane rating; check for
presence of alcohol in the fuel. Refuel as
necessary.