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What is the gas oil mixture on a homelite st-155 string trimmer?

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Your trimmer should give yu th fuel ratio somewhere close to where you fill it. It will be in this orat- 50:1 forexample

Posted on Sep 12, 2009


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1 Answer

What is the gas to oil ratio for weed eaters?

Most gas weed eaters use 2-cycle engines. For the Homelite 2-cycle engine trimmers, use a 50:1 ratio of gasoline to the Homelite lubricant. (For 1 gallon of gas, add 2.6 oz of the oil.)

Many Homelite tool manuals are available here: . Scroll down to find your string trimmer.

I hope this helps.

Cindy Wells

Jul 16, 2011 | Homelite Garden

1 Answer

Need to know the fuel/oil mixture for homelite trimmer no. st-285bc

always been safe with one oil to one gallon of gas usually sais 1 gallon on oil mix.

Jul 04, 2011 | Homelite Garden

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I have a Homelite ST-155 String Trimmer. It says to prime the unit by pumping the bulb. I cannot find this bulb on the unit anywhere. Please tell me where it is. Thank you

Hi and welcome to FixYa, I am Kelly
I have been searching for a while now and know exactly why you came to FixYa for help. It is like a mystery as to where your primer bulb is even online!
Model number for the ST-155 is UT-20539-D

Look on the top or the bottom of the carb for a soft rubber button. Depress it not more than 2 times.
What is even more frustrating is... the carbs for this model are from 2 different manufacturers. One being ZAMA and the other being WALBRO. They are similar but the parts are not interchangable.

I have been helping people for quite some time now and this was one of the most frustrating searches. Not your fault... Just the manufacturer seems to want the location to be a huge secret.
I tried to find an owners manual for the ST155 via company websites also.. no joy!

Thanks for choosing FixYa,

Jun 13, 2011 | Garden

2 Answers

What is the oil to gas ratio for a Homelite ST-155 trimmer?

40 to 1,,,40 parts petrol to 1 part oil,,,,1/2 oz oil to 1 pint or petrol
but iv all ways ran mine on 30 to 1 ok,,it smokes a little,,but if its smoking there is oil getting to the piston and bearings,,,so the engine will live a lot longer,,,my pall runs his on 20 to 1??? now that smokes!
but he's run it on this for 25 plus years??? and he gun's it to death,,
so il say no more!

Jun 13, 2010 | Homelite Garden

1 Answer


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.

May 14, 2010 | Homelite Mighty Lite Lawn Trimmer

1 Answer

Homelite ST-145 oil leaking from muffler

you are right it should be 32:1 for most homelites

Jul 19, 2009 | Garden

1 Answer

Installing new line on my string grass trimmer

Cut two separate pieces of string, about 7 ft. each.

Stick the end of the line in the hole on the inside of spool.

Wind clockwise onto spool, putting the line that is closest to the ground on first.

Once you have winded this piece on, lock the last 4 inches of line through the slits on spool.

Repeat process for second piece of line, locking the last 4 inches in slot opposite the other locked in piece.

Put the spool on the trimmer, feeding the end of lines through either hole on trimmer.

Before you push the spool all the way on, pull the strings out of the locked position.


Jul 03, 2009 | Homelite Mighty Lite Lawn Trimmer

1 Answer

Correct gas to oil ratio for Homelite Mighty String Trimmer Model

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.

Jun 18, 2009 | Homelite Mighty Lite Lawn Trimmer

1 Answer

Oil to gas ratio

heres a link for homelite service manual

pg 4 states that fuel/oil mix is 50;1
2.5 oz per gallon

Apr 20, 2009 | Garden

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