Its $135 for a new one. Mine is completely blocked. If you blow on it, nothing goes through. Any ideas?What is the internal structure of these things?Is it just a cavity or is there like a zig-zag path?

Cleaning the spark arrestor. Here’s the only thing I could find and it’s a video on how to clean your spark arrestor, which requires removing the muffler from the generator.

There are carbon solvents made for cleaning guns, automotive use, cookware, etc. If you don’t want to buy one specific for your job, I would remove the muffler from the engine and try some oven cleaner on it. :):)

Most small engine mufflers are not designed to be taken apart, they are usually just welded together - or even just press fit together. Mufflers interiors can be a variety of styles, from "maze like" to baffles to just an expansion chamber.Do you think it was / is a mouse nest? That is not uncommon in a stored generator. Have you tried a simple piece of wire with the end turned into a small hook? Clothes hangers work great. Many times you can get most of the material out, the rest will "burn off" - make sure you run the generator in a safe area for a long time in case anything catches on fire (temporarily, we hope!).If it is carbon build up, that is difficult to get out if it is not near the inlet or outlet. If you are lucky, the carbon buildup may just be at or near the outlet, especially if there is a "spark arrestor" screen - simply scraping that clean may work.If a part / baffle inside the muffler has been damaged, usually rusted, and is blocking the exhaust, the muffler needs to be replaced. Many times in the process of "cleaning out" a muffler, it will be damaged to the point of needing replacement anyways. If it isn't working now, you may as well try to clean it, even if in the process it gets damaged more.Good luck - lol, maybe $135 is worth it after all.

This is an easy job. Follow these instructions HERE.Note that in the manual it says to clean the spark arrester every 100 hours or 6 months.I bet no one does it, I know I don't. I do mine every so often when I think about it and that is usually way over 2-300 hours.

Soak the muffler in carburetor cleaner, you can find carburetor cleaner in a gallon dip/soak can with basket. Most auto parts stores have it. When done soaking, you rinse off with water.

Eu2000i muffler cleaning ideas? | Good Sam Community

MEXICOWANDERER
Explorer
Aug 04, 2020
Better compounds containing nitrogen can become an explosive. Like if the Techron managed to soak through the carbon before swelling up. Creating a chamber. Apply heat the cleaner expands uses the carbon as a catalyst and you don't want to know the rest of this story

But max dose your gas tank for the remainder of the year. This will help remove the carbon and it will be a lot of snot in the muffler.

I had to learn all this stuff from scratch. My Honda experience goes back to the days of the 50, and the 305. Almost 60 years ago. Doesn't make me an expert merely pre-manual days.

Since this is resolved here's a generator story. Belt driven with divorced generator with brushes. External voltage adjustment knob.it was the days of normal transformer battery chargers. I used the knob to fine tune the charge rate. The generator had brushes that used to hang up when parked in a beach.

A replacement loaded brush holder cost %21,00

Do forty years later when I read in this thread how much a Honda muffler cost I winced
opnspaces
Navigator II
Aug 04, 2020
If still plugged let it dry really well and then run it through a cycle of a self cleaning oven. It might burn it off.
groundhogy
Explorer
Aug 04, 2020
Original Poster:
I tried brake cleaner.. not so effective
Carb cleaner.. better than brake cleaner it seemed.

This carbon seems resistant to cleaning.

Then I fired up my grill and tossed in the muffler. Turned it over a few times. I think the hotter you get, the more carbon gets burned off. Dont think my grill was extremely hot. When i was done, i tapped the muffler all over.

Also picked up some rubber corks at the hardware store. This so i could fill the muffler with carb cleaner. But also you can drill a little hole through the cork and put the little red straw through it. Then you can blow canned air through it if you don’t have a compressor available.

The cork/can thing also allowed me to bust through the initial full blockage.

Muffler pretty clean now.
groundhogy
Explorer
Jul 27, 2020
Yes. Probably carbon or murder hornet nests ... maybe (hope not) a mouse nest.
Im rooting for carbon.

I looked up muffler construction. Some are just metal chambers, but some also have fiberglass packing.

I also think auto shops get parts dip cleaned on a regular basis
wnjj
Explorer II
Jul 27, 2020
Have you tried compressed air, maybe while tapping the muffler on a hard surface?

There's also AC Delco upper engine cleaner which is used to dissolve carbon build up in the combustion chamber. If whatever is blocking your muffler is carbon-like, that may work.
groundhogy
Explorer
Jul 27, 2020
Its the whole muffler.
Muffler clogged, not the arrestor screen.
OkieGene
Explorer
Jul 27, 2020
groundhogy wrote:
Its $135 for a new one.

Mine is completely blocked. If you blow on it, nothing goes through.

Any ideas?

What is the internal structure of these things?
Is it just a cavity or is there like a zig-zag path?

$135? Really? Where are you getting that price for a replacement spark arrester? I just did a google search and found them for around $20-ish.

Under $17 bucks Original Honda Part

You might mosey over to YouTube and in the search box enter how to clean your Honda Eu2000i spark arrester. Seems to be some good videos there.
Boon_Docker
Explorer III
Jul 27, 2020
Lynnmor wrote:
shastagary wrote:

Great... send me your manual so that I can read it

why not just use google to get the manual there is also a service manual near the bottom of the search

honda google manual search

It's amazing how so many electrons are wasted talking about a problem and how so few are used to simply look up the manual. :S

Not everyone realizes that manuals can be found on the net. :S
Fisherman
Explorer
Jul 27, 2020
Lynnmor wrote:
shastagary wrote:

Great... send me your manual so that I can read it

why not just use google to get the manual there is also a service manual near the bottom of the search

honda google manual search

It's amazing how so many electrons are wasted talking about a problem and how so few are used to simply look up the manual. :S

Last sentence pretty much sums up the problem with a lot of people.
Lynnmor
Explorer
Jul 27, 2020
shastagary wrote:

Great... send me your manual so that I can read it

why not just use google to get the manual there is also a service manual near the bottom of the search

honda google manual search

It's amazing how so many electrons are wasted talking about a problem and how so few are used to simply look up the manual. :S