Dirty carb? Try these tips - Snowblower Forum : Snow Blower Forums
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post #1 of 11 Old 03-14-2020, 09:15 AM Thread Starter
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Dirty carb? Try these tips

Dirty carb, Rough running, AND you don't want to remove the carb! With some Chinese engines it can be time consuming and a nuisance.

Remove the bowl, clean with a rag

Remove any accessible jets

Spray carb cleaner using the little red blow tube that comes with the can of carb cleaner in the jet holes and in the holes where the jet came out of. Spray the carb cleaner up in the main jet tube that is located inside the fuel bowl.

Put it back together

Snap your fingers

Start it

I've have had success with some snow blowers just removing the bowl and spraying up the main jet.

Check the clarity of the gas by draining some in to a clear soda bottle to ensure it's fresh. Do not trust the home owner!!! It may be fresh but the gas can could have had old gas in it, adding fresh gas may not be enough; the same for adding fresh gas to the gas tank when it's had old gas in it or its been sitting for too long.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #2 of 11 Old 03-14-2020, 10:08 AM
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Originally Posted by JLawrence08648 View Post
Dirty carb, Rough running, AND you don't want to remove the carb! With some Chinese engines it can be time consuming and a nuisance.

Remove the bowl, clean with a rag

Remove any accessible jets

Spray carb cleaner using the little red blow tube that comes with the can of carb cleaner in the jet holes and in the holes where the jet came out of. Spray the carb cleaner up in the main jet tube that is located inside the fuel bowl.

Put it back together

Snap your fingers

Start it

I've have had success with some snow blowers just removing the bowl and spraying up the main jet.

Check the clarity of the gas by draining some in to a clear soda bottle to ensure it's fresh. Do not trust the home owner!!! It may be fresh but the gas can could have had old gas in it, adding fresh gas may not be enough; the same for adding fresh gas to the gas tank when it's had old gas in it or its been sitting for too long.
90 % of the Honda carb cleaning I do is done successfully in frame. I also remove airbox and spray thru all holes and remove the idle jet and clean. replace that little O ring if necessary.

usually spraying up the pick up tube is enough depending how dirty it was when I removed bowl. In some cases I remove the main jet and emulsion tube.

Then follow up and dry with compressed air.

This works about 90% of the time and usually takes only about 20 minutes with a Honda Carb. In the other 10% stubborn carbs need to be removed and placed in the ultrasonic cleaner.

"It Feels Like Beer O'Clock "
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post #3 of 11 Old 03-14-2020, 10:19 AM Thread Starter
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Ah, I forgot the compressed air, works really well. Loosen up the crap with the carb cleaner then blow it away with the compressed air, may have to do it a few times waiting a bit between carb sprays, but certainly the simplest way. Puts a smile on your face if it works. Makes you feel like a genius and impresses the customer that you know exactly what to do.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #4 of 11 Old 03-14-2020, 01:19 PM
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Originally Posted by JLawrence08648 View Post
Ah, I forgot the compressed air, works really well. Loosen up the crap with the carb cleaner then blow it away with the compressed air, may have to do it a few times waiting a bit between carb sprays, but certainly the simplest way. Puts a smile on your face if it works. Makes you feel like a genius and impresses the customer that you know exactly what to do.

it's funny you mention that it makes you feel smart. EVERY time I start an engine after a carb cleaning I cross my fingers and wait.......when it runs right I am surprised.."I did it?"

and then people think you are a magic man cause they brought the machine over thinking it was a lost cause and you got it started and running like new . the word get's around.

I get calls from people and the first thing they say " I heard you're the man when it comes to Honda's.

makes you feel good.

I always considered you the guy when it comes to cleaning carburetors. learned a lot from you here.

Thanks.

"It Feels Like Beer O'Clock "
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post #5 of 11 Old 03-14-2020, 01:53 PM
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Dirty plugged up carbs..been a long winter of them, and now we move into the "spring/summer" machines people have.
What is even worse is when you clean a carb and get the machine running, only to have the same person bring it back 2 months later for the same issue...ah but they know we can fix it.
Newer carbs are in some ways easier to clean..the older Tecumseh ones seem to get plugged in two or three areas.
Ethanol fuel, a love/hate relationship, and one of the biggest repeat business customer creators out there.

BTW, I do suggest where to purchase non ethanol fuel to all of my customers, and fill their machine with a fresh tank of fuel when I service it..many just comment..."I know, and then say it is just good to have their snow blower back."
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post #6 of 11 Old 03-14-2020, 03:37 PM Thread Starter
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Dirty plugged up carbs..been a long winter of them, and now we move into the "spring/summer" machines people have.

What is even worse is when you clean a carb and get the machine running, only to have the same person bring it back 2 months later for the same issue.

and fill their machine with a fresh tank of fuel when I service it..many just comment..."I know, and then say it is just good to have their snow blower back."
When someone drops off equipment, I emphasize to bring me their gas can, whether they say it's empty or not. The gas in the gas can tells a lot. I tell them I will look at it or empty it and fill it with fresh gas, fuel stabilizer, and a fuel cleaner. I want to make sure you start right.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #7 of 11 Old 03-14-2020, 09:11 PM
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i use compressed air most of the time. if compresses air doesn't work to clean out any blocked or clogged passages you likely need to remove and possibly replace the carb at that point. sometimes i will use oven cleaner but that also usually removes any protective coating from anything so got to be careful when using it but it does clean almost anything.

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post #8 of 11 Old 03-15-2020, 03:11 AM
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Originally Posted by crazzywolfie View Post
i use compressed air most of the time. if compresses air doesn't work to clean out any blocked or clogged passages you likely need to remove and possibly replace the carb at that point. sometimes i will use oven cleaner but that also usually removes any protective coating from anything so got to be careful when using it but it does clean almost anything.
Your oven cleaner works good on baked on carbon deposits on things like piston heads, cylinder heads, valve faces and stems plus intake and exhaust ports.
I would be leary about using it on carburetors and their parts, like you mentioned, it will remove any protective coatings on them and make them corrode in time.
It also helps break down grease and oil build-up.

Last edited by ST1100A; 03-15-2020 at 03:13 AM.
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post #9 of 11 Old 03-15-2020, 08:09 AM
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if your going to have to replace the carb anyways what do you have to loose trying oven cleaner? i know it works good for cleaning rest of the engine parts way more effectively than most products. i usually use it cleaning intake manifolds which can be pretty stubborn.

arien 520 snow blower 6.5hp swap
yardworks 31AH6WKF515
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post #10 of 11 Old 03-15-2020, 11:10 PM
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Uh, everything? Most oven cleaner is caustic, and really tears up aluminum. Myself, I'd try pretty much anything else first, no matter what the status of the carb . . .
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