Homelite UT21546, UT21506, UT21947, UT21907 manual Troubleshooting, Air Filter Screen earlier in this

TROUBLESHOOTING

Problem	Possible Cause	Solution
Engine will not start.	No spark.	Check spark. Remove spark plug. Re-
		attach the spark plug cap and lay spark
		plug on metal cylinder. Pull the starter
		rope and watch for spark at spark plug
		tip. If there is no spark, repeat test with
		a new spark plug.
	No fuel.	Push primer bulb until bulb is full of
		fuel. If bulb does not fill, primary fuel
		delivery system is blocked. Contact
		a servicing dealer. If primer bulb fills,
		engine may be flooded, proceed to
		next item.
	Engine is flooded.	Remove spark plug, turn trimmer so
		spark plug hole is aimed at the ground.
		Rotate the choke dial to “RUN” posi-
		tion and pull starter cord 10 to 15
		times. This will clear excess fuel from
		engine. Clean and reinstall spark plug.
		Pull starter three times with choke dial
		at “RUN”. If engine does not start,
		rotate choke dial to “FULL CHOKE”
		position and repeat normal starting
		procedure. If engine still fails to start,
		repeat procedure with a new spark
		plug.
	Starter rope pulls harder now than	Contact a servicing dealer.
	when new.
Engine starts but will not accelerate.	Engine requires approximately three	Allow engine to completely warm up. If
	minutes to warm up.	engine does not accelerate after three
		minutes, contact a servicing dealer.
Engine starts but will only run at high	Carburetor requires adjustment.	Contact a servicing dealer.
speed at half choke.
Engine does not reach full speed and	Check lubricant fuel mixture.	Use fresh fuel and the correct 2-cycle
emits excessive smoke.		lubricant mix.
	Air filter is dirty.	Clean air filter. Refer to Cleaning
		the Air Filter Screen earlier in this
		manual.
	Carburetor out of adjustment.	Contact a servicing dealer.
Engine starts, runs, and accelerates	Idle speed screw on carburetor needs	Turn idle speed screw clockwise to
but will not idle.	adjustment.	increase idle speed. See figure 19.

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