Sportster Models 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster, XR1200, and the Nightster.
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2003 XL1200C

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Old Oct 22, 2025 | 05:31 PM
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Default 2003 XL1200C

Hello I have a Sportster 1200, what carbs do you recomend to upgrade to.
Thank You
Dale
 
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Old Oct 22, 2025 | 08:56 PM
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Use the carb that came with it, the CV carb is reliable and functions well. If it is not running correctly, check the intake manifold seals and maybe rebuild the carb.

If you cannot find original parts for it at your dealer, go with CV Performance parts. Do not buy parts off Amazon (Chinese), they may or may not work well.

https://cv-performance.com/

Additional Carb information here:

https://sportsterpedia.com/doku.php/techtalk:evo:carb01

https://sportsterpedia.com/doku.php/techtalk:evo:carb02

 
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Old Oct 23, 2025 | 12:14 AM
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As stated above, the CV40 is a good carb that is very reliable and easy to work on. Unless you have done some significant engine mods there is really no benefit to moving to a mikuni or S&S. The best upgrade is getting the CV performance delux kit for it.
 
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Old Oct 23, 2025 | 06:51 AM
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1 more vote for the CV40 OEM carb. It can handle a lot more than most Sportys are putting out.
 
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Old Oct 23, 2025 | 03:51 PM
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Mikuni 42!!!!!!!!
 
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Old Oct 23, 2025 | 04:46 PM
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Originally Posted by Madnss
Mikuni 42!!!!!!!!
Assuming were talking about a stock bike with maybe aftermarket pipes and air cleaner, that is the best option if you're hell bent on changing the carb, but that's a lot of $$$ and work for little, if any, gain.
 
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Old Oct 23, 2025 | 07:29 PM
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Originally Posted by OCSpringer
The best upgrade is getting the CV performance deluxe kit for it.
I'm surprised it does not include a new accelerator pump diaphragm and screws. I used CVP parts as well on my bike. Might as well change the intake manifold seals while you have the carb off, then everything is nice an refreshed.

John
 

Last edited by John Harper; Oct 23, 2025 at 07:40 PM.
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Old Oct 30, 2025 | 07:07 AM
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+1 on using the stock carb with a CV Performance kit. I did that on my 03 and she runs great.
 
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Old Oct 31, 2025 | 06:50 AM
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Originally Posted by OCSpringer
Assuming were talking about a stock bike with maybe aftermarket pipes and air cleaner, that is the best option if you're hell bent on changing the carb, but that's a lot of $$$ and work for little, if any, gain.
A lot of work to install a mikuni? I must be doing it wrong.
 
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Old Feb 2, 2026 | 06:48 PM
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Originally Posted by DJR1959
Hello I have a Sportster 1200, what carbs do you recomend to upgrade to.
Thank You
Dale
I have S&S super E on both my Sporty's, I've never had any issues.
 
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