Gummed up ATV carburetor?

[Jon B]

I will start by saying I screwed up. I have a 2005 Yamaha Kodiak 4x4, I typically turn off the fuel and run the ATV out of gas before parking it.

Apparently, I forgot to do this and it sat for 5 months with pump gas in it. Yeah it's the low octane crud that likely has some ethanol in it.

I drained the tank, put a gallon of high octane fuel in it with a 4 ounces of B-12 chemtool carburetor cleaner fuel additive in it.

Went to start it and it took forever to warm up with thr choke on. Finally got it to idle with the choke on.

Once warmed up, it idled fine. When I would roll into the throttle, it would go to about 1/2-2/3 position before bogging down. It wouldn't go more than about 30 mph it usually does around 45-50.

Does anyone have any ideas on what I can do to clean up the gummy carb without replacing it?

Thanks in advance!

[Walker]

Drain the tank, drain the carb, pour chemtool in the tank and let it fill the carb with pure chemtool and let it sit for 30 minutes. put gas in the tank and fire her up. If that doesn't work you probably need to tear the carb down but I think it will work. 5 months is not really all that long.

[Lost10mm]

Do you have access to an ultrasonic cleaner? They work wonders with some solution from Hornaday. If you're curious, tear down your carb as far as you can. Any gunk you see inside is also what's clogging your jets and passages.

[Hoggslayer]

I had take mine off and tear it apart and spray it out with Chemtool. It wasn't that difficult. Just de careful and you shouldn't even need a kit. Pay close attention to the butterfly shaft. Mine got some junk in it a galled up the bore and the throttle hung wide open.

[Bard]

The jets get a coating of "varnish" on them making them slightly bigger than they were. If you don't have success with Seafoam etc... you will need to break down the carb and clean and should just replace the jets.

[Wits_End]

I don't think octane levels has anything to do with it. I've never heard of higher octane not having ethanol.

Cleaning the jets on a carb is fairly simple. Take off side panel, two hose clamps, wiggle it out or sideways, remove bowl, unscrew jet, use small wire and air to clean it out.

[Jackal]

Get a cheap sonic cleaner off Amazon if you don't have one already. Or at the auto parts store you can find a chemical carburetor cleaner by Berrymen that comes in a gallon paint bucket with a basket that you soak in them in. If you do have to replace it, then check ebay for an aftermarket. You should be able to find one on there for typically less than $75.

[Walker]

Where are you and the bike located?

[Bryan11]

I've also found that the ethanol fuel will eat up rubber hoses and seals and usually need replaced. I had chainsaw and a pressure washer where the fuel pick-up line was worthless and not getting fuel to the engine.

[tdwinklr]

Following.
Mine isn't gummed up, just backfiring through the air cleaner.
Any suggestions for solving that?

[60 Deluxe]

Put injector cleaner in your gas and drive it. Or you can spend a couple of hours pulling the carb off and cleaning it. My biggest problem has been finding a wire small enough for the low speed jet. One thing that has worked for me was pulling the jets, putting them in a pill bottle, then covering them with acetone for about an hour. Give it a shake every now and then. The acetone works quickly on the gum or varnish.

[Bucknaked]

I don’t think you need to remove the carb first! Poor the whole 12oz can of chem 12 in your tank and drive it, it will clean your carb and your jets. Do the easy things first! Check your fuel lines for dry rot to make sure you’re not sucking air!

[Bard]

Following.
Mine isn't gummed up, just backfiring through the air cleaner.
Any suggestions for solving that?

Backfiring is usually lean secondary jet, cleaning or replacing is also the solution. Rejetting carbs at high elevation and them bringing them to sea level causes a lean carb and jets should be replaced, so beware if bought from out of state.

[dmk]

Believe it or not, I've had good luck w/ Mechanic In a Bottle. It's saved a few things I thought were beyond help.

[Graysonhogs]

I will start by saying I screwed up. I have a 2005 Yamaha Kodiak 4x4, I typically turn off the fuel and run the ATV out of gas before parking it.

Apparently, I forgot to do this and it sat for 5 months with pump gas in it. Yeah it's the low octane crud that likely has some ethanol in it.

I drained the tank, put a gallon of high octane fuel in it with a 4 ounces of B-12 chemtool carburetor cleaner fuel additive in it.

Went to start it and it took forever to warm up with thr choke on. Finally got it to idle with the choke on.

Once warmed up, it idled fine. When I would roll into the throttle, it would go to about 1/2-2/3 position before bogging down. It wouldn't go more than about 30 mph it usually does around 45-50.

Does anyone have any ideas on what I can do to clean up the gummy carb without replacing it?

Thanks in advance!

just get a new carb. The Diaphragm is most likely shot.