HOMELITE TRIM N' EDGE/ 25CC (MODEL UT 20779) - SAT IDLE FOR 2-3 YEARS -WORKED FINE WHEN STORED. REPLACED FUEL LINES & FUEL FILTER, PUT FRESH GAS & OIL MIXTURE (50:1). WILL NOT START - SPUTTERED A LITTLE ON ONE ATTEMPT. APPRECIATE SUGGESTIONS.

Diaphrams can be tricky sometimes...seating can be irritating. If carb disassembled and cleaned out...might have to check adjustments. Make sure screw didn't get loose. I had one do that before when governor broke.

I would check for spark and check the fuel lines, especially if fuel is left in it. Also if fuel left in you will have to empty the lines and carburetor or pull it enough to clear. Another thing to consider is that if fuel was left in it that the carburetor may need a rebuild, replacing the diaphrams.

I hope this is helpful for you.

The spark plug gap should be set at .025 to .030 inches for trimmers. Try to set gap closer to .025.

You will need the correct size fuel line first. Follow this:

1. Remove the old filter/weight from the fuel tank.
2. Take a new fuel line piece about 8 inches long and cut about a 45 degree angle cut on one end.
3. Lightly moisten the cut end of the fuel line and insert it into the tank from the outside, pushing it in while turning as far as possible.
4. Use a needle nose plyers to reach in and pull the line to the fuel line cap. Cut the line and replace the filter.
5. Pull the line back the way you put it in leaving about 4 inches within the tank and re-attach to the carburetor or primer bulb (depending on the actual model/age)

It will work, but it is extreemly important to have the correct size fuel line to work with.

sounds like an air/ fuel mixture/ratio problem.there should be two screws side by side near the carb. crank trimmer and slowly adjust screws, in or out, till engine runs smoothly..

You can go to a small engine repair shop, parts shop or look on eBay and they should have the fuel lines you need. Not very expensive, about $1.00/foot for new Tygon lines. You are way overdue for replacing yours. The ethanol in the gas does a job on them.

Before adjusting anything, check the fuel filter, air filter, and muffler for plugging. Check the condition of the fuel lines for decay or other damage. Tighten all carburetor fasteners. Make sure you have fresh fuel mix in the tank. Does the primer bulb pull fresh fuel into itself when pumped? Turn both jet screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and should allow the engine to start and run. Start the engine and allow it to warm up, then pull the throttle full on. Adjust H needle CW until the engine starts to speed up, but still 4-stroking. Proper final adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for fairly good idle, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!

If you look closely there should be 2 holes in the fuel tank, also if you look inside the fuel tank there should be some remaining pieces of the fuel line and a fuel filter. If this has been sitting for any length of time you will also want to replace the fuel filter.

Now comes the fun... or a challenge

To start with you will need 2 sizes of fuel line ( go to a small engine repair shop) while you are replacing things you may want to buy a new primer bulb also.

to insert the fuel lines into the tank you will have to cut a tapered tail about 2 " long so that you can grab the fuel line with a needle nose and pull them through and out of the tank so that you can trim off the tapered tails. On one install the fuel filter and stick back into the tank, on the other trim the tapered tail off and pull the line back into the tank but leave about 1" sticking through the tank.

Now hook up you fuel lines to the carb and/ or primer bulb

Fill tank half full with fuel ... now test the installation if it doesn't pump fuel but instead you can hear it blow bubbles in the tank it is simple just reverse your lines on the carb / primer bulb

Retest if it works like it should you are ready to attempt to start it... good luck

you will have to mix oil and gas in a one gallon container
your ratio will be 40:1 that is 3.2oz of oil to one gallon of gas
you will need two cycle oil as some are pre bottled at this amount and some you have to measure as some dispensers have markings for you.
Do NOT USE MOTOR OIL OR OUTBOARD MOTOR OIL.
I would use 89 octane mid grade especially if fuel will be sitting.
Look for the 2 cycle oil that contains a fuel stabilizer in it if possible if not thats fine.

Dont want to throw you off but some will say you can use a 50:1 mix---2.6 oz to 1gallon
if you can find the SYNTHETIC type 2 cycle oil this would be your alternative and would be ok to use also.

Hello:

Have you Removed the Muffler and Checked the Exhaust Port and Muffler for Carbin Restriction?
Remove the Muffler and Start the Unit. If the Operates Correctly, then the Spark Arrestor Screen is Clogged and the Muffler/Screen Requires Replacing.
Make Sure the Exhaust Port is Not Restricted Also.
Hope this Helps.

Good Luck

Respectfully

John