Honda UMS425U Questions & Answers

Not sure what your question is.... are you looking for what next steps? If it is new, I would suggest taking it back to where you bought it, if it is older, I would suggest taking it to a mower shop for a service. Just a few trouble-shooting ideas: If it has sat in the garage for a long time, add some fresh petrol (new from the petrol station, not more old fuel, as it can go "bad"), make sure the on/off switch is set to On, make sure you have primed a few times, and the choke lever is set correctly. Other than that, if those ideas don't work, get it serviced.

I just bought a Honda speed feed from Mowers Galore.

Yes I had the same problem mine fell off and rolled down the street. I went to Bunnings and bought a universal head that has three fixed pieces of line that you replace when they wear out. The Honda heads are worthless and had I known how bad they were I would not have bought it in the first place.

Replace the carburetor, the pump fails, you can buy it online pretty cheap

Sorry. My technical knowledge of the engine is limited. I suggest you have a small engine mechanic take a look to determine the problem. It does sound as if something is amiss with the carburettor, something that needs an experienced technician.

Best of luck.

Had the same problem, the tip to check the petrol is on the right tack. The trimmer has a felt filter and gets clogged up. Clean or replace and should run again like mine.
Regards,Dave

Line may be blocked or primer may have slight hole. Also possibly needs new fuel filter. Only way to fix is replace defective part. Any local authorised repairer can do. Sorry no easy fix.

I think your Local Council man might have put the fuel lines on the wrong way there is 2 fuel lines coming from the tank just pull them off the carby and reverse them 1 is to draw the fuel up to the carby the other is a return line to the tank from the carby.

Not sure what Cable You are taking about if it is the Nylon Feed Line it will be cut off to the correct length once you start your Machine or make sure the nylon Feed Line is only about the length of your palm of you hand and it should be no trouble for you

You can Google the Honda USM 425U Owner's Manual and download it

make sure you flick the choke back to run position once it warms up. Other then that it may need a tune up.

I sure you put the choke back in the run position then try a new spark plug and have new petrol Petrol does go off after a few months

Check the Fuel Lines are not bent if you have one that is kinked there is your Problem pull it off and cut a small piece off to shorten the fuel line do one at a time don't mix them up
One is for the Filter and the other is for the return fuel

I have been using mine for 3 years now, at all angles, with no problems whatsoever. Also, I am a left handed user, so I hold it differently to start with.
As for handing it by the spool, I have no idea as mine are stored horizontally.

I have used mine on the side for 2 years now with no problems. I store mine flat so can't help you there. Still starts first time,every time.

I hang mine from garden shed roof...by using hooks....starts every time. Aftervon pull of the cord

If you wound the line onto the spool I can only guess that it is on backwards. Try removing the line from the spool and rewind it onto the spool in the opposite direction. As it is a new trimmer, if that doesnt work take it back to the dealer and get them to show you.

I didn't wind the line onto the spool, it was already wound on when i picked it up from the dealer.
Not sure why its doing this.

I received a tip from the Honda salesman when I purchased my whipper snipper. He suggested keeping your cord in water to prevent it getting brittle - it works outstandingly. It makes it easier to wind on, reduces coiling, and makes the cord last longer.

What size line are you using? If it is 2mm it will be gone in about 30 seconds. The spool will fit 3mm from memory, and with that size it is incredible how well it cuts, and how long it lasts. I am presently using 2.7mm which is not too bad. As for bumping the head, because of the durability of the thicker line I dont bump, I hand feed it when it needs it( mostly because I wore out the last head bumping it on hard ground ). There are 2 ways to wind the line on. When you pull the head off you will notice 2 round holes. Feed line into one hole and back out the other( they are quite close together) then take one length through the slot so you have one line to wrap on the top section and one on the bottom section.
The other way was to take a length of line, double it over and squeeze it at the halfway mark. now pop the bent over bit of line onto the cutout bit of the head so 1/2 is on the top section and half is on the bottom section. bit hard to explain, sorry.

Thank you for your helpful information. I will try your suggestions.

No. unless you hit the trimmer head to hard rock. Just open the head cover and replace the line.

Even though this is a different model, install as per video, takes 2 minutes and you are good to go. Link here: https://www.youtube.com/watch?v=XCtEn_fRL6U

I'm not a mechanic but I don't see any reason why not as long as the fuel line can get fuel into the engine. Check the manual to be 100% sure.

I am a mechanic. This is a 4 stroke motor so fuel has nothing to do with it. The manual doesnt say anything about it.

Yes upside down is fine. It has a spinning lubricator so any angle is good

Push the strimmer head against a hard surface

Try contacting the Honda shop 92743555