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Author Topic: Clogged Slow Jets - Cleaning or . . . . ?  (Read 221 times)
Foozle
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Posts: 375


Lexington, KY, USA


« on: March 25, 2026, 06:58:04 AM »

Guys and gals:

Has anyone (please be brutally honest, if necessary) been successful in using any type of fuel additive (Berryman's, Techron, Seafoam, etc.) to clean obstructed slow jets?

I won't go into neglectful details, but have all the telltale signs of partially clogged slow jets on my 1998 Valk.

I've gone through numerous sets of carbs before, but am wondering if I can forego this exercise in lieu of a simpler, less involved solution.

In advance, thanks for any experiences or guidance you're able to share.

Terry
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Willow
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Posts: 16859


Excessive comfort breeds weakness. PttP

Olathe, KS


WWW
« Reply #1 on: March 25, 2026, 09:06:07 AM »

Clogged is a bit extreme, but I use Berryman's to clean the carbs fairly regularly.
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Foozle
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Posts: 375


Lexington, KY, USA


« Reply #2 on: March 25, 2026, 09:47:56 AM »

Clogged is a bit extreme, but I use Berryman's to clean the carbs fairly regularly.

Thanks, Carl.

If memory serves, I put a can of Berryman's in the current tank of fuel (and ran it through the carbs) - so it's been percolating for several months.  We'll see.

In the past, however, I've had no luck aside from replacing the actual slow jets.

Here in Lexington (KY), we now have virtually no access to ethanol-free petrol. As a result, I've stocked up on Marine STA-BIL.

I know . . . . . . . I simply need to ride more.

Terry
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Joe333x
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Posts: 208


Boston


« Reply #3 on: March 25, 2026, 11:24:59 AM »

Another vote for Berrymans, it’s worth a try before taking everything apart. I completely rebuilt my carbs and they ran awesome, put her away for the winter and then the following spring she was running rough and back firing, put some berrymans it cleared the issue up.
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Foozle
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Posts: 375


Lexington, KY, USA


« Reply #4 on: March 25, 2026, 11:45:09 AM »

Another vote for Berrymans, it’s worth a try before taking everything apart. I completely rebuilt my carbs and they ran awesome, put her away for the winter and then the following spring she was running rough and back firing, put some berrymans it cleared the issue up.

Thanks, Joe - that's encouraging.

Mine only sat dormant for one year, so I'm crossing my fingers for a chemical solution.

Terry
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98valk
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Posts: 13841


South Jersey


« Reply #5 on: March 25, 2026, 12:20:42 PM »

OEM o-rings are Buna-N

""B-12 Chemtool Carburetor Choke Cleaner
Toluene 108-88-3 40-50
Methanol 67-56-1 20-30
Acetone 67-64-1 20-30
Methyl Ethyl Ketone ""

https://www1.mscdirect.com/MSDS/MSDS00009/08099822-20151111.PDF

see that word "Acetone" how many put into their gas? it is also in many fuel additives.

""BUNA-N should not be used in highly polar solvents such as acetone and methyl
ethyl ketone, nor should it be used in chlorinated hydrocarbons, ozone or nitro hydrocarbons.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C  10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
rug_burn
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Posts: 336


Brea, CA


« Reply #6 on: March 25, 2026, 04:24:58 PM »

I never had any luck with those carb cleaners after they get clogged.   
 I had to replace all my low-midrange jets, and ligfhtly ream out all the high speed jets with a hand held drill (.101, #38)
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98valk
Member
*****
Posts: 13841


South Jersey


« Reply #7 on: March 25, 2026, 04:50:30 PM »

try TC-W3 will also clean the ring pack. see here about it and how to use. TC-W3 is a spec so any brand will work.

https://www.ls1.com/forums/showthread.php?t=91206
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C  10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
Foozle
Member
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Posts: 375


Lexington, KY, USA


« Reply #8 on: March 26, 2026, 05:12:14 AM »

I never had any luck with those carb cleaners after they get clogged.   
 I had to replace all my low-midrange jets, and ligfhtly ream out all the high speed jets with a hand held drill (.101, #38)

Me neither, actually - I was hoping someone had a magical elixir.

Looks like I've got some carb work in my future.  Angry

Terry
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Foozle
Member
*****
Posts: 375


Lexington, KY, USA


« Reply #9 on: March 26, 2026, 05:31:27 AM »

OEM o-rings are Buna-N

""B-12 Chemtool Carburetor Choke Cleaner
Toluene 108-88-3 40-50
Methanol 67-56-1 20-30
Acetone 67-64-1 20-30
Methyl Ethyl Ketone ""

https://www1.mscdirect.com/MSDS/MSDS00009/08099822-20151111.PDF

see that word "Acetone" how many put into their gas? it is also in many fuel additives.

""BUNA-N should not be used in highly polar solvents such as acetone and methyl
ethyl ketone, nor should it be used in chlorinated hydrocarbons, ozone or nitro hydrocarbons.

Thanks for the info.  FWIW, my O-rings have been replaced with those from RedEye - I'm unsure if they're made from BUNA-N or something else.
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98valk
Member
*****
Posts: 13841


South Jersey


« Reply #10 on: March 26, 2026, 05:50:30 AM »

OEM o-rings are Buna-N

""B-12 Chemtool Carburetor Choke Cleaner
Toluene 108-88-3 40-50
Methanol 67-56-1 20-30
Acetone 67-64-1 20-30
Methyl Ethyl Ketone ""

https://www1.mscdirect.com/MSDS/MSDS00009/08099822-20151111.PDF

see that word "Acetone" how many put into their gas? it is also in many fuel additives.

""BUNA-N should not be used in highly polar solvents such as acetone and methyl
ethyl ketone, nor should it be used in chlorinated hydrocarbons, ozone or nitro hydrocarbons.

Thanks for the info.  FWIW, my O-rings have been replaced with those from RedEye - I'm unsure if they're made from BUNA-N or something else.

they are Viton.
I use the TC-W3 in every tank. keeps everything clean and lubricated esp the needles in the needle wells which are not replaceable in these carbs.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C  10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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