19
Does the engine crank?
Faulty recoil starter.
Fluid in the crankcase.
Internal damage.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
NO
Good compression?
Loose spark plug.
Excess wear on cylinder, piston, rings.
Tighten and re-test.
NO
YES
Does the tank contain fresh
fuel of the proper grade?
Refill with clean fresh unleaded gasoline with a
pump octane of 87 or higher, mixed with
Shindaiwa Premium 2-cycle mixing oil at a
50:1 gasoline/oil ratio.
Fuel incorrect, stale, or contaminated;
mixture incorrect.
NO
YES
Is fuel visible and moving in
the return line when priming?
Check for clogged fuel filter and/or vent.
Replace fuel filter or vent as required. Restart.
NO
Is there spark at the spark
plug wire terminal?
The ignition switch is in “O” (OFF) position.
Shorted ignition system.
Faulty ignition unit.
Move switch to “I” (ON) position and re-start.
NO
YES
YES
Check the spark plug.
If the plug is wet, excess fuel may be in
the cylinder.
The plug is fouled or improperly gapped.
The plug is damaged internally or of the
wrong size.
Crank the engine with the plug removed,
replace the plug, and re-start.
Clean and re-gap the plug to 0.024 inch
(0.6 mm). Re-start.
Replace the plug with a NGK BMR6A or
equivalent type spark plug of the correct
heat range. Restart.
YES
What To Check
Possible Cause
Remedy
Troubleshooting Guide
ENGINE DOES NOT START
LOW POWER OUTPUT
Is the engine overheating?
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.
Shorten trimmer line. Cut at a slower rate.
Consult with an authorized servicing dealer.
Refill with clean fresh unleaded gasoline with a
pump octane of 87 or higher, mixed with
Shindaiwa Premium 2-cycle mixing oil at a
50:1 gasoline/oil ratio.
Consult with an authorized servicing dealer.
Engine is rough at all speeds.
May also have black smoke
and/or unburned fuel at the
exhaust.
Clogged air filter.
Loose or damaged spark plug.
Air leakage or clogged fuel line.
Water in the fuel.
Piston seizure.
Faulty carburetor and/or diaphragm.
Clean or replace the air filter.
Tighten or replace the plug with a NGK BMR6A
or equivalent type spark plug of the correct
heat range. Restart.
Repair or replace filter and/or fuel line.
Refill with fresh fuel/oil mixture. See Page 11.
Consult with an authorized servicing dealer.
Engine is knocking.
Overheating condition.
Improper fuel.
Carbon deposits in the combustion
chamber.
See above.
Check fuel octane rating; check for presence of
alcohol in the fuel(page 11). Refuel as necessary.
Consult with an authorized servicing dealer.
What To Check
Possible Cause
Remedy
