That thing should have a two year residental warranty?? if it does Go above the dealers head to seek satisfaction. IMO if you not Satisfied Honda should fix it by replacing the carb. or replacing the unit. Could be something as simple as diaphram installed backward or defective carb or engine. either way seek higher level help before you warranty ruins out if it hasn't already. if you brought it used or reconditioned then you will probably have to live with it, rekit the carb. or buy a new carb hoping it will fix the problem. Hopefully you have you paper work from the dealer you have taken it to to prove the unit has a problem. You may have to drive to another dealer, but unless you just want to blow it off you got to put pressure on the dealership and beyond while the warranty is still good. IMO once the warranty is gone all they will see is $$$ when you bring it in.

I have the same problem since day one! It is sporadic, but now does it more and more. Took off the muffler and air cleaner- same problem.

I am stumped- since it happened on day one- I think it is not the carb but an adjustment???

Ya same here cant seem to get mine to run either. Had the carb off a dozen times and still dont Know how to keep it running. Talk to the dealer and they dont no how to fix it either. So im totally stumped....

Just a stab in the dark but if the fuel systems are clean, check the valve lash. A valve (or two) that is too tight will cause hard starting and lack of power when warmed up.

Wow , talk about less than Qualified Dealer net work . As Rc and arc have indicated this is less the Rocket Science . A little carb cleaning or diaphram (carb kit) worse case scenerio along with perhaps a new fuel filter and purhaps valve adjustment if 4-cycle engine and these engines should be operational . I doubt many of these have more than the 50 hrs running time that has been reported .
Must admit majority of the trimmers i have repaired have been 2-stroke , which by nature seem a little more tempermental . The 4-stroke units normally need minimal service usually new plug and fuel or air filter and perhaps fine tuning and valve lash adjustment and annual oil change . Hope you find a local dealer with a little common knowledge .

My honda trimmer is two years old with few hours on it. I purchased this trimmer because I have had good luck with Honda products. This trimmer is not worth the money I spent on it!
The trimmer has always been difficult to start. It usually takes 3 or 4 pulls (after priming and with the choke).
More recently my trimmer has been bogging down when on full throttle too. The air filter is clean.
I haven't brought it in but I am suspecting that it is the same problem I had with a mower of mine. I think that the Ethenol in today's fuel is causing the problem.
I have heard of people having problems with gaskets and such. On my WeedEater lawn mower I have had to replace the carb gasket due to the ethenol. It too would not run correctly.
I cannot confirm this as the culprit with my trimmer.
Anyone have any suggestions on this theory before I spend money on repair?

Riz: Sounds like carb fuel restrictions , an inexpensive rapair would be to add fuel cleaner to the fresh fuel and clean the needle jets circuits with cleaner , tag wire and compressed air . The bogging is a symtom of the low speed circuit becoming restricted as is the high speed (high RPM)similarly becoming restricted potentially by ethanol gumming or just some dirt . The hard starting unfortunately seems to be the environmentally friendly lean burn carbs of today . This is somethng most units today have in common . You could rejet and retune but if it starts routinely with 3-4 pulls I would just leave it as is . Let us know how you make out , since the unit is only 2 yrs old the fuel filter is probably fine but while your cleaning the carb check the filter for restriction anyways . You may wish to try Star*tron Ethanol fuel treatment available at local Walmart it has seemed to recieve some rather high praise be more than a few forum members within ethanol ailments . :)

I have a new Honda 25 trimmer. Always used ethanol 10 gas (86 octane). Worked fine. It worked flawlessly for the last year or so, and suddenly won't idle and sometimes stumbles while revving. Took out carb & cleaned, blew out all orifices, put back together. New air filter. Same thing. Adjusted idle. Same. My question; does carb have an air screw? Didn't see one. This carb had 2 diaphragms-wasn't sure how to check those. Really doubt if it's ignition, that's very rare. Usually carb problem. Will try checking fuel & fuel filter next. Help!

I ran into a similar problem with my brand new (2 week old) Honda HHT35S string trimmer. Basically it worked great for the first two hours of use. But then it developed a problem where it would sputter a little and would not run. I figured I had just run out of gas, but when I filled up the tank and tried to restart it, it was difficult to start and when I was able to get it started, it had a rough idle and would only run a few seconds. I thought I was going to have to return the unit or take it into a service repair shop which I was not thrilled about considering I just purchased this unit new. So I thought why not take a brief look into what's wrong before I load it up and take it back. Since it would attempt to start but then die out quickly, I realized that it had to be either a fuel or air intake issue. I do use 92 octane mixed with Sta‑Bil (fuel stabilizer). I was using brand new gasoline so I knew it was not a stale gas issue. I started inspecting the trimmer by removing the flip down breather/air cleaner cover and checked the air filter to make sure it was not clogged up in any way. Nope it looked brand spanking new ... as it should. Next I started pressing the fuel primer bulb to make sure gas was getting into the carb. I noticed that after depressing the bulb, it would slowly expand back to it original position. Then it stopped expanding completely and just remained depressed. Ah-ha! A fuel-air lock! That would certainly explain the symptoms. I then proceeded to inspect the fuel supply and return lines. It turned out that the black fuel line had a kink in it. Thus it was restricting fuel flow and eventually blocked it all together. For now I have just repositioned the line to get the kink out, but it looks like the rubber hose may be a bit too long and the excess length may be contributing to the kink. So if this problem returns, then I may cut this hose a little shorter so that it has a more natural and gradual bend and does not kink. Hope this post may help somebody who may be experiencing the same problem.

Thanks, Robert

Good one Robert! That makes perfect sense and that happens a lot on Motorcycles & cars.

I had the same problem that Robert Savage described. Exactly the same symptoms with the priming bulb. My fuel line had a piece of heat shrink in the bend area. Perhaps this was an attempt by Honda to fix the problem. I shortened the fuel line and the fuel primed properly and the engine started right up.

I don't own a Honda, but have used gas powered string trimmers for 30 years. I can't tell you what is causing the problem, but it sounds to me like the unit is flooding out (Too much fuel) when idling. It is very hard to start a flooded out trimmer. When ever this happens and the unit won't start, try pulling the spark plug and checking to see if it is wet. If is is wet, then it is flooded.