22 questions from our users
UMK425E. Engine will not stop after running for about 30 minutes. It is very difficult to stop. Have had this from new for quite a number of years and this is the first time I've had this issue. Is the engine stop switch at fault?
Sounds like your stop switch has faulty connection. Remove the red button and look underneath to check for debris. Mine stops the second it is pushed.
You could try turn the choke on and pump primer to flood the engine to stop it if desperate, but this is not recommended.
Is it save to tilt this unit on its side whilst running to do Edging like footpaths etc ?
Logic tells me if I do this to a 4 stroke and I will seize the motor. If this is true I'm regretting buying this and iI should have got a 2 stroke trimmer which does not matter if you tip it sideways or upside down whilst running because its lubricated by the petrol .
It’s designed to be used upside down, as is the fuel tank shape and its weighted strainer. The Honda website says “The UMK425 Loop Brushcutter features full 360 "any-side-up" operation, so you can use and store it in any position”
Thanks for the reply , I'm still confused as i thought if you run a 4 stroke motor upside down or sideways the motor it will starve the motor of oil and damage the motor . Whilst you say it can be used upside down , how will this not damage the motor from oil starvation ?
How to place cutting chord
Anyone know the difference between the Honda UMK 425 and the Honda UMK 425U?
I have a Honda bent shaft HLT422 trimmer I need a gear head is there any compatable parts. It has a square head on the end of the cable inside the shaft.
how to replace a new head
how to restring umk425u
Does my brush cutter have a fuse to start the motor or just the spark plug
Hi, have a near new UMK 425U and just purchased a SSHH hedge trimmer attachment. The UMK 425U has a different drive to the SSHH. The UMK 435U has an eccentric "half moon" and the SSHH a gear share drive. Any ideas?
How much does it cost
How do I grease the head on the UMK425U . There are two screws on the head and are hard to unscrew
Where is the idle screw on a honda brush cutter?
Seems I have a fuel leak somewhere - not the bulb as that’s been replaced. Anyone have any ideas where I should look?
Could be a split in the tank, or the fuel line. Does it leak when the tanks half full? On an angle, and if so which angle? Does the fuel stream out or simply drip? If so from which component does it run from? Is it a heavy smell of fuel or just a damp patch that collects dust? You mentioned the bulb being replaced, is it an old or heavily used machine, and has someone overhauled it and not fitted a fuel component properly? From working on older cars, I used to trace fuel leaks back from the fuel tank until I found the source, perhaps try that troubleshooting approach. Too many ifs at this stage to point the finger at one definite thing.
Choke keeps dropping. Any ideas?
Hi Sam, can you clarify what you mean? If you are talking about the choke lever, it has a detent position when it is raised so it "clicks" in place. If the lever is flopping down from the raised position then something is loose on the choke shaft inside the cowling and am sure your Honda dealer can sort it quickly or somebody mechanically inclined.
Hey, can anyone advise the best width of trimmer cable for the UMK425? I just use it home but I have a big yard with a lot of concrete edges. Thanks.
What are the differences between a made in Japan model and one made in Thailand ? What does a Honda store supply?
Hi got a umk425E model runs fine starts up fine but if go to full power its always cutting out? Any help?
Hard to say. Could be fuel related. Check choke off once started, fuel is not stale, airfilter is ok.best to get the service shop to check if a problem
Gday, I just read your Honda brush cutter review on Product Review, hope you got your machine going by now but if you haven't here is your fix
1. the Honda fuel filter breaks down and the small bits then get drawn into a internal fuel screen, some Honda filters seem to last longer than others, we have two Honda's, one filter lasted no time at all then blocked the carby screen with the small bits off the filter, the other one lasted a long time.
Replace with a Stihl type fuel filter
2. If the above problem is all O.K there is a very small brass mixture screw in the top of the carby, in the middle of the part that the throttle cable connects to.
Give it a very small tweak anticlockwise while trying to rev it. the Honda will go a lot better.
I just been given a snipper with a bent shaft though much prefer the straight as it spins anti clockwise, can I change the shaft or direction?
you cant change the direction of spin, but with enough money and parts you could change the shaft, but the cost would be to great. It will be best and more cost effective to buy the model that suits you.
Just purchased a new replacement head for my umk425 as the last one wore out. Can't find any instructions on how to remove and replace entire head. Any help please.
Hi mate, search for my YouTube channel, alexaescht, and find the video about changing to the brushcutter blade on the Honda UMK425. That video shows how to take the nylon head off and you can follow the reverse to put it back on. The biggest thing to remember is that the thread is in reverse, so to loosen the head off, you must turn it clockwise, and to tighten it, you must turn it anticlockwise. Alex.
I already have this UMK425 and im very happy and satisfied with it. I am now looking for a cheaper secondary line trimmer and is seriously considering getting the Bent Shaft version of it simce its on sale at the moment.
Can someone tell me some Pros & Cons of this compared to the standard straight shaft?
Im sure Honda have designed this for a purpose other than just to give end users a preference.
Basically the only real difference is in the drive shaft; instead of it being made of solid metal, like the straight-shaft versions, it's made of a flexible cable. This allows it to be 'bend' through the bent portion of the outer shaft. Some people prefer the bent-shaft versions because they're generally lighter, they can be easier to edge with and they're cheaper, obviously.
If you're going to do any serious work with it, then I wouldn't go for a bent-shaft one, but if it's purely for doing the lawn edges or similar, then it'll be fine.
On the bent shaft models the line trimmer head spins in the opposite direction to straight shaft models. Although the bent shaft model has the same 25cc Honda motor as your UMK425. The bent shaft Honda is considered the domestic model, I use mine commercially doing domestic type lawns. I find it great when doing lawn edges as I seem to have a more precise control when turning it on an angle for getting that perfect lawn edge.I did have to do a slight modification to the guard as it would only allow a small length of line to protrude from the trimmer head before cutting it off. I think it is designed this way so as not to make the Honda work so hard. Perhaps give it a longer life. I'm sure you may even void your warranty by doing what I do. But saying that, I've used the bent shaft Honda commercially for a number of years and got a very good run from them.
The newer models are not as good as the older ones, like every thing these days. I found when I purchased my new model bent shaft Honda the guard and loop handle were like something off a cheap home brand whipper snipper. My older model Honda bent shaft had a larger guard that had an adjustable blade to control the length of trimmer line. The latest model now has a smaller guard with no adjustable blade. My older model had a good sized rubberized loop handle. The newer model has a smaller, thinner all plastic handle. I was able to buy an older model handle as a spare part to put on my new Honda.
MarkIV The Honda bent shaft in a good secondary line trimmer. You may find you'll use it more than your straight shaft. It all depends on what your trimming or brush cutting.
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