Homelite string trimmer mighty lite

Something could be keeping it from getting the right mix of air and gas. It could be a crack in one of the fuel lines or primer bulb. Maybe the carb needs rebuilt. I made some videos on how to do all that. I got all my parts form Home Depot, except the carb rebuild kit I got from Amazon. Hope this helps.

50 to 1

Check that the muffler is not blocked. Your symptoms are typical of this condition.

have you tried to replace the H T lead?

the problem is in the carburetor most likely, it may be cleaned and adjusted, if not it will likely need a new carb

3 oz. 2 cycle oil to 1 gallon fresh fuel and
to keep your fuel fresh add some fuel stabilizer found at walmart for ethanol blended fuel ( it will say marine formula on bottle) and add it to the gas can you fill your trimmer with ,follow directions on bottle for treatment vs. capacity.

type in homelitest and ut number on the trimmer and then search google . maybe

most trimmers are 50:1. or 40:1. i would use synthetic 2 cycle oil and use the 50:1 ratio. i know guys with trimmers that require 50:1, and they use synthetic at 80:1 with no problems for years. they say the engine runs cleaner. i am a part-time lawn care operator.

did you try fresh gas

I had this same problem, would run a couple of seconds, stop, and you couldn't start it again.
Had good gas/oil mix 50:1 and 25cc Homelite. Had replaced the fuel filter, gas, spark plug, and took carb apart and cleaned with carb cleaner and primer bulb worked fine. None of that fixed it. What did? Take the muffler off and see if it will start and run with the muffler off. If it does, chances are the muffler is clogged. Also check the exhaust ports and clean them out if plugged with black oil carbon residue.
My muffler was clogged up, took it off, cleaned out the exhaust ports, there was some oil that was in the muffler(oil that didn't burn during combustion). It now starts and runs like a champ on first or second pull.