26 questions from our users
Hey guys. Chasing some information or assistance on a new purchase of a straight shaft umk435. My old model needed to be retired after 14 years faithful service. Never any major problems at all with it. The new one (about 2 months old since purchase) is really giving me grief though with leaking fuel from the cap. This has nothing to do with the venting hole as the fuel can be seen finding its way around the screw threads on the fuel tanks neck when in an inverted position. I've since been to my local dealer and (politely)purchased an additional cap from them also which started leaking within the week. I do not over tighten the cap by the way, so a damaged seal cannot be to blame for the problem. I noticed that my original units tank seal has a slightly different design to its outer edges compared with the new one and it makes me wonder if a cheaper seal is being used by the manufacturer, the rubber not capable of prolonged contact with the fuel in the tank. Even more irritating is the fact that i cannot simply purchase the seal, just the entire cap and seal combo.....Grrrrr. Any feedback appreciated.
I'm using Honda for heavy duty commercial work in the tropics down under and all i can say there's nothing equal to Honda products so far. For commercial all day use there's nothing else but a four stroke torquey Honda.
Beware of the identical crappy copies!
4 Stroke HONDA is the best machine in the World.
You definitely need that 4 Stroke HONDA TORQUE and the proper 4 Stroke lubrication instead of playing with 2 Stroke low life Toys!!!
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.
Thank for that. I took the switch out but could not take it apart so I sprayed it liberally with electrical contact cleaner, reassembled and it now works perfectly. It is a very good product in general if you keep up the maintenance routines.
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 ?
If the Honda website is saying it can be used in any position , What magic are they using to prevent damage to the motor from oil starvation ? - If HONDA state this on their website it must be false and misleading information which defies the laws of physics for gravity .
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 do I grease the head on the UMK425U . There are two screws on the head and are hard to unscrew
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.
Use the orange line. 2.4mm. Cuting against rock or concrete will need more frequent bumps to spool line out as it will wear more quickly
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