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  1. #1
    thayermcswain
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    Default Mikuni VM38F-9 38MM carb on a 1200 sportster? why not?

    -In a pinch and i need a new carburetor for my 1997 1200s. my CV carb literally broke in half. Casting of the body cracked.

    I have on hand a mikuni VM38F-9, which if I'm reading right, is a 38mm. I'm not making a hot rod. the bike has drag pipes and thats it.

    If this carb will run on bigger engines like a shovel, wont it work on a bike that I'm using as an around-town cruiser?

    The only issue i could see is hooking up the VOES to work wit it. I have a whiskey throttle in it, and can figure out the cable.

    Post your comments. Thanks in advance.

  2. #2
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    Why not just keep an eye on your plugs.,..,.,.,,

  3. #3
    thayermcswain
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    Quote Originally Posted by Tattooo View Post
    Why not just keep an eye on your plugs.,..,.,.,,
    thanks for the reply.


    are you saying to run the carb and watch the plugs to see if its running lean/rich?

    send it?

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    Quote Originally Posted by thayermcswain View Post
    thanks for the reply.
    are you saying to run the carb and watch the plugs to see if its running lean/rich?

    Yep that's what I'm saying all right....... Best of luck..............

  5. #5
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    Function and Tuning of a Mikuni VM-38-9

    Tuning and Adjustments

    Troubleshooting

    Helpful Links

    http://sportsterpedia.com/doku.php/techtalk:ref:carb01i

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    Mikunis are excellent carbs for Sportsters and popular on Ironheads from 900cc up so you should be fine. You can drill the intake manifold and press in a VOES tube or if the fit ain't great hit the tube (can be any brass tube that works) with some JB Weld to lock in the tube. You can also drill the Mikuni mounting flange where a tube won't interfere with anything and mount the tube there instead.

    Even better is the only good Harley manifold, the aftermarket Ram Jett solid. The ones stamped S are for Evo Sporties. They turn up on Ebay now and then as they're out of production and don't require a brace or use seals, though bracing our Mikuni air filter is a good idea since it's a spigot mount carb. You definitely want the carb well supported to avoid leaks.

    Post pics when ya get it mounted as most Evo Sporties just run CVs. Mikunis are dead simple and have no CV diaphragm to pinhole or crack.

    Don't reuse old stock HD intake-to-head seals as they tend to dry out and leak especially when a carb is disturbed. Pulling your carb is a good time to swap them out and that's less hassle than buttoning up your work only to have an intake leak.
    Last edited by farmall; 2 Days Ago at 11:08 PM.

  7. #7
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    farmall,
    check your PM for ram-jett

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