Question about Homelite ZR40502 Factory-Reconditioned 26cc MightyLite 20" Gas Hedge Trimme

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Stales out when u take the choke off must run with full choke on

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You will need to take to a shop and have the technician adjust the carburetor. Plus I recommend mixing your fuel mixture at 40:1(3.2 oz 2 cycle oil to 1 gallon of gas) instead of the 50:1(2.6 oz 2 cycle oil to 1 gallon of gas). If your fuel mixture is over 30 days old, it is considered bad gas.
All the manufacturers I have heard from this year have made this knowledge known.
Good Day.

Posted on Oct 10, 2009

  • William McCusker
    William McCusker Jul 16, 2011

    why do you recommend mixing the oil 40:1?



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Starts and runs only full choke

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The old gas might have done the unit in!
Stale fuel is MUCH more susceptible to pre-ignition and detonation and could possibly have ruined the rings/piston/cylinder.
The symptom you describe is, without a doubt, an engine suffering from fuel starvation.
The quick and easy check? Set the unit on the ground and grab the starter rope and try to pick the saw up using only the rope handle. Good compression should support the weight of the saw.
If it fails that test, pull the muffler off and check the piston/rings/walls for scoring. If it looks ugly, it's cooked.
If not, go back to the fuel supply. Fuel lines are especially suspect when old gas has contacted them. Lightly pressurizing the fuel line and flexing it might reveal tiny holes and/or cracks that would cause a starvation condition. Check fuel filter while you're in there!
Finally, open the carb and check the inlet screen directly opposite of the inlet needle. Hold it up to light to VERIFY that it isn't swollen shut. (Another problem caused by stale fuel.) Check that the diapragm is soft and pliable and has no holes.

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1 Answer

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Has the air filter been removed, damaged, or the airbox not seated propelry on the carbs neck, this would cause it to run lean hence requiring the choke to be in operation all the time. Have you tried fresh fuel?? This goes stale after a while. I hope this is helpful, Ian

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Hi and welcome to FixYa,

Initially, a few possibilities you may want to check/explore:
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Good luck and Thank you for using FixYa. Happy Holidays.

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