Poulan 545140903 Replace Spark Plug, Carburetor Adjustments, Troubleshooting Table Cause Remedy

REPLACE SPARK PLUG

Replace spark plug each year to ensure the engine starts easier and runs better. Set spark plug gap at 0.034 inch (0.85 mm). Igni- tion timing is fixed, nonadjustable.

1.Twist, then pull off spark plug boot.

2.Remove spark plug from cylinder and dis- card.

3.Replace with NGK BPMR71-9 spark plug and tighten securely with a 3/4 inch (19 mm) socket wrench.

4.Reinstall the spark plug boot.

CARBURETOR ADJUSTMENTS

Your carburetor is equipped with limiter caps. Carburetor adjustment is a complicated task. We recommend that you take your unit to an authorized service dealer. Damage may occur if you turn the needles beyond the limiter stops.

TROUBLESHOOTING TABLE

WARNING: Always stop unit and disconnect spark plug before performing any of the recommended remedies below other than remedies that require operation of the unit.

TROUBLE		CAUSE	REMEDY
Engine will not	1.	Engine flooded.	1. See “Starting a Flooded Engine”
start.			in Operation section.
	2.	Fuel tank empty.	2. Fill tank with correct fuel mixture.
	3.	Spark plug not firing.	3. Install new spark plug.
	4.	Fuel not reaching	4. Check for dirty fuel filter; replace.
		carburetor.	Check for kinked or split fuel line;
			repair or replace.
	5.	Compression low.	5. Contact an authorized service dealer.
Engine will not	1.	Fuel not reaching	1. Check for dirty fuel filter; replace.
idle properly.		carburetor.	Check for kinked or split fuel line;
			repair or replace.
	2.	Carburetor requires
			2. See “Carburetor Adjustment” in
		adjustment.	Service and Adjustments section.
	3.	Crankshaft seals worn.	3. Contact an authorized service dealer
	4.	Compression low.	4. Contact an authorized service dealer.
Engine will not	1. Air filter dirty.		1. Clean or replace air filter.
accelerate,	2. Fuel not reaching		2. Check for dirty fuel filter; replace.
lacks power, or		carburetor.	Check for kinked or split fuel line;
dies under a			repair or replace.
	3. Spark plug fouled.		3. Clean or replace spark plug
load.
			and re-gap.
	4. Carburetor requires		4. See “Carburetor Adjustment” in
		adjustment.	Service and Adjustments section.
	5. Carbon build up.		5. Contact an authorized service dealer.
	6. Compression low.		6. Contact an authorized service dealer.
Engine smokes	1. Choke partially on.		1. Adjust choke.
excessively.	2. Fuel mixture incorrect.		2. Empty fuel tank and refill with
	3. Air filter dirty.		correct fuel mixture.
			3. Clean or replace air filter.
	4. Carburetor requires		4. See “Carburetor Adjustment” in
		adjustment.	Service and Adjustments section.
Engine runs hot.	1. Fuel mixture incorrect.		1. See “Fueling Engine” in Operation
			section.
	2. Spark plug incorrect.		2. Replace with correct spark plug.
	3. Carburetor requires		3. See “Carburetor Adjustment” in
		adjustment.	Service and Adjustments section.
	4. Carbon build up.		4. Contact an authorized service dealer.

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