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Troub|eshootin Guide
What To Check
Does the engine crank?
YES 1
Good compression?
YES
Does the tank contain
fresh fuel of the proper
grade?
Possible Cause
_ aulty recoil starter.
Flnkt in the crankcase.
Internal damage.
INO I Ix)ose spark plug.
Excess wear on cylinder, piston, rings.
/ Valves not seating.
YES Jr
NO I Fuelincorrect, stale or contaminated;
V_ mixture incorrect.
Is fuel visible and moving [NO J Check for clogged fuel filter and/or vent.
in the return line when _ Priming pump not flmctioning properly.priming?
YES
Is there spark at the spark
plug wire terminal?
YES J_
Check the spark plug.
INO IThe ignition switch is in "O" {OFF)
position.
I I Shorted ignition ground.
[ Faulty ignition unit.
If the plug is wet, excess fuel may be in
the cylinder.
Tile plug is fouled or improperly gapped.
Tile plug is damaged internally or of the
wrong size.
Remedy
Consult with an authorized servicing dealer.
Tighten and re-test.
Consult with an authorized servicing dealer.
Refill with flesh, clean unleaded gasoline with
a pump octane of 87 or higher mixed with
a 2-cycle air cooled nlixing oil that meets or
exceeds ISO-L-EGD and/or JASO FC classified
oils at 5(}:1gasoline/oil ratio.
Replace fl_elfilter or vent as required; restart.
Consult with an authorized servicing dealer.
Move switch to 'T' (ON) position and restart.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
Crank the engine with the plug removed,
reinstall the plug, and restart.
Clean and regap the plug to 0.024 -0.028
inch (0.6 - (1.7ram). Restart.
Replace the plug with an NGK CMR5H or
equivalent resistor type spark plug of the
correct heat range. Set spark plug electrode
gall to (/.024-(/.028 inch (0.6-(/.7 ram).
Possible Cause
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.
Remedy
Shorten trimmer line. Cut at a slower rate.
Consult with an authorized servicing dealer.
Refill with flesh, clean unleaded gasoline with
a pump octane of 87 or higher mixed with
a 2-cycle air cooled mLxing 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
Is tile engine overheating? [ _
/
Engine is rough at all I ,
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 10.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
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. 10). Refuel as necessary.
Consult with an authorized servicing dealer.
Consult with an authorized servicing dealer.
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