Troubeshootin Guide, YES Jr Possible Cause

Troubeshootin Guide

What To Check

Does the engine crank?

YES 1

Good compression?

YES

Does the tank contain fresh fuel of the proper grade?

YES Jr

Possible Cause

Flnkt in the crankcase.

_ aulty recoil starter. Internal damage.

I NO I Ix)ose spark plug.

Excess wear on cylinder, piston, rings.

/Valves not seating.

NO I Fuelincorrect, stale or contaminated;

V_ mixture incorrect.

Remedy

Consult with an authorized servicing dealer.

Consult with an authorized servicing dealer. Tighten and re-test.

Refill with flesh, clean unleaded gasoline with a pump octane of 87 or higher mixed with

a 2-cycleair cooled nlixing oil that meets or exceeds ISO-L-EGD and/or JASO FC classified oils at 5(}:1gasoline/oil ratio.

Is fuel visible and moving [NO J Check for clogged fuel filter and/or vent.

priming?the return line when

Priming pump not flmctioning properly.

YES

Replace fl_el filter or vent as required; restart.

Consult with an authorized servicing dealer.

Is there spark at the spark INO plug wire terminal?

[

YES J_

Check the spark plug.

IThe ignition switch is in "O" {OFF) position.

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.

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).

What To Check

Is tile engine overheating? [

Possible Cause

Operator is overworking the unit.

Carburetor mixture is too lean.

Improper fuel ratio.

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-cycleair cooled mLxing oil that meets or exceeds ISO-L-EGD and/or JASO FC classified oils at 50:1 gasoline/oil ratio.

Fan, fan cover, cylinder fins dirty or damaged.

Carbon deposits on the piston or in the muffler.

/Clogged air cleaner element.

Engine	is rough at all		I	,
speeds.	May	also have		Loose or damaged spark plug.
black smoke		and/or		Loose or damaged spark plug.
black smoke		and/or
unburned fuel at the				Air leakage or clogged fuel line.
exhaust.				Air leakage or clogged fuel line.
exhaust.
				Water	in the fuel.
				Piston	seizure.
				Faulty	carburetor	and/or diaphragm.
				Valve	clearance	set incorrectly.
Engine	is knocking.		]_	Overheating condition.
Engine	is knocking.		]_
				Improper fuel.
				Carbon deposits in the combustion
				chamber.
				Valve	clearance	set incorrectly.

Clean, repair or replace as necessary.

Consult with an authorized servicing dealer.

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.

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.