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1986 Sportster Carb Swap

Discussion in 'Motorcycle Tech Talk' started by darikfrye91, Jul 30, 2016.

  1. darikfrye91

    darikfrye91 Member

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    Hello I have a 86 Sportster 1100 that uses a Keihin carb. And it broke at the mounting point. I've noticed the CV carb is a lot cheaper and easier to find. Is it possible to switch to the CV carb? And what would I need to make it fit and work? Thanks! IMG_1319.JPG


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    darikfrye91, Jul 30, 2016
    #1
  3. Red Rider

    Red Rider Well-Known Member

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    Bump to Sporty guys (yeah, I inherited one, but it is EFI)
    Red Rider, Jul 31, 2016
    #2
    darikfrye91 likes this.
  4. hotroadking

    hotroadking Super Moderator Staff Member

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    My guess would be intake, flanges, gaskets, cv carb, backing plate for filter
    hotroadking, Jul 31, 2016
    #3
  5. kenfuzed

    kenfuzed Administrator Staff Member

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    This is a common swap and the CV carb runs much better on these bikes. First you'll need a donor CV carburetor, preferably a 1993 or newer model (improved float after 1992). You can tell the year by the last 2 digits of the part number following the dash.

    Next you'll need a flange adapter to mate the slip fit spigot of the CV carb to your 2-bolt manifold flange. We stock them on our website. The cables should adapt on your year to the CV carb.

    Lastly you'll need to make or find a bracket to hold the air cleaner in place.
    kenfuzed, Aug 1, 2016
    #4
    Red Rider likes this.
  6. joshbob

    joshbob Well-Known Member

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    The bracket is a necessity. I made one for my shovelhead when I switched from the Keihin butterfly carb to the CV. It is simply a straight piece of 3/4" mild steel bolted at one end to the bottom stud of the manifold adaptor and to the motor block. You can see it in the picture below.

    If you get a used CV carb, be sure to go with one of Ken's upgrades. I got the Stage 1 CVP kit and my carb has operated flawlessly for 6 years now. Another suggestion: pour a dollop of Marvel Mystery Oil in your gas tank every time you fill up - it'll help keep your carb clean and improve your milage a bit as well.
    joshbob, Aug 19, 2016
    #5
    darikfrye91 likes this.

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