Shindaiwa 81719 User Manual

15

Troubleshooting Guide

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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

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Loose spark plug.
Excess wear on cylinder, piston, rings.
Valves not seating.

Tighten and re-test.

NO

YES

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Refill with fresh, clean unleaded gasoline with 
a pump octane of 87 or higher mixed with 
a 2-cycle air cooled mixing oil that meets or 
exceeds ISO-L-EGD and/or JASO FC classified 
oils at 50:1 gasoline/oil ratio.

Fuel incorrect, stale or contaminated; 
mixture incorrect.

NO

YES

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Check for clogged fuel filter and/or vent.

Priming pump not functioning properly.

Replace fuel filter or vent as required; restart.

Consult with an authorized servicing dealer.

NO

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The ignition switch is in “O” (OFF) 
position.
Shorted ignition ground.
Faulty ignition unit.

Move switch to “I” (ON) position and restart.

NO

YES

YES

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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, 
reinstall the plug, and restart.

Clean and regap the plug to 0.024 - 0.028
inch (0.6 - 0.7 mm). Restart.

Replace the plug with an NGK CMR5H or 
equivalent resistor type spark plug of the 
correct heat range. Set spark plug electrode 
gap to 0.024-0.028 inch (0.6-0.7 mm).

YES

What To Check

Possible Cause

Remedy

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.

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 

a 2-cycle air cooled mixing oil that meets or 

exceeds ISO-L-EGD and/or JASO FC classified 

oils at 50:1 gasoline/oil ratio.

Clean, repair or replace as necessary.

Consult with an authorized servicing dealer.

What To Check

Possible Cause

Remedy

Engine is rough at all 

speeds. May also have

black smoke and/or 

unburned fuel at the

exhaust.

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.

Valve clearance set  incorrectly.

Service the air cleaner element.

Tighten or replace.

Repair or replace filter and/or fuel line.

Replace the fuel. See page 7.

Consult with an authorized servicing dealer.

Engine is knocking.

Overheating condition.

Improper fuel.

Carbon deposits in the combustion 

chamber.

Valve clearance set incorrectly.

See above.

Check fuel octane rating; check for presence of

alcohol in the fuel (pg. 7). Refuel as necessary.

Consult with an authorized servicing dealer.

Adjust valves (see page 13).