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Old 09-04-2013, 01:08 AM
newwelder27's Avatar
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Join Date: Aug 2013
Location: colorado
Posts: 7
carb question?????????

Alright guys i am beating my head in the wall i can't seem to find the part numbers on my carb so i can order a rebuild kit. I found 2 different sets on the carb both numbers are 6 digit and from what i can find zenith carbs are 5 digit right? I need help i want to order my kits to rebuild them but i dont want to order the wrong thing. Please any help would be great.

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Old 09-04-2013, 12:17 PM
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Location: Modesto CA
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Consider telling us what car? and/or engine? you are addressing.
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Old 09-04-2013, 11:39 PM
newwelder27's Avatar
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Join Date: Aug 2013
Location: colorado
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Alright it is a 1965 220sb fintail. Here is the specs of the motor i am still trying to figure out what i have. Any help would be great.
should be picture of vin and specs and here is the engine block.

here is the carb i took apart to clean and see if i could find a part number but there is like 3 numbers on each carb so far that i found.

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Old 09-05-2013, 07:20 AM
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Join Date: Jul 2012
Location: Mooresville, NC
Posts: 159
Not sure that there is a difference in the kits, I have a 68 230 W110 and have simply ordered the 35-40 INAT kits with success.

Here is a link to an online manual (Thanks Jaime!), see the data sheet for the specs for your car:

Mercedes Benz Zenith Carb Manual |
1968 230 W110
1985 300TDT W123/S123
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Old 09-05-2013, 09:35 AM
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Join Date: Dec 2007
Location: Houston, Texas
Posts: 1,148
My 1962 220Sb has Solex carbs.

1962 220Sb ~ The Emerald Bullet
1957 Ponton 220S

2001 S600 Daily Driver
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Old 09-05-2013, 08:24 PM
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Location: Chapel Hill, NC
Posts: 161
You can get the kits from ********AZ. They have the best price. It is a Royze kit that will have extra gaskets for different versions of the 35/40 INAT carb. Make sure to get the kit with the secondary diaphagm. Completely disassemble one carb at a time so you'll have on to look at. Soak the three parts of the body in laquer thinner for a couple of days then blow out all of the circuits. Check each part for flatness. The top especially can be bent (most people think it is warped from heat, but is quite malleable and will bend if the screw in the center for the air cleaner is tightened too much). Put it on a flat surface on a piece of 220 grit sandpaper and sand it enough to see if the surface is flat. If it is really out you can flatten it in a vise or with a small hammer on a flat surface. Make sure to get all of the jets and check valves back in the right holes. The primary and secondary have different orifices. Get the bench adjustments right and then all you have to do is synchronise them. Be sure to adjust the valves and set the timing before you try to adjust the carbs or they will never be right. These are great carbs. You will have people say to ditch them for Webers, but when set up right the Zeniths are superior. Good luck.
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Old 09-07-2013, 12:32 AM
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Location: Long Island, NY
Posts: 3,840
You should have early zeniths there. The horns are like 2mm narrower than the ones that show up on the later 2.5 and 2.8 liter motors of the early 70s. Also, they have completely different jet setups. write down which little bits of brass come from where.

Your car came with an M180 motor designed in the 50s and produced in one form or another, growing bigger to 2.8l into the 70s. It's simple, elegant and works well usually.

Getting the carbs sorted out will tax your patience, but it will be rewarding to have good running car. Take that manual one step at a time and remember that the first rule to getting your carbs right is that the ignition system must be timed correctly. The second rule is that you need to have close to a full tank of gas when your trying to get that sweet spot of performance. But yes, lets get those carbs cleaned and reassembled before we worry about driving it.


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