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Page last modified 22:16, 28 Oct 2007 by internetscooter
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Vespa Labs > Vespa Tuning > Carburetors & Carburetion > Polini 28/30mm Carb Manifold

Polini 28/30mm Carb Manifold

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    Hmmm... how does Polini make the manifold fit both the 28/30 mm carbs? Answer is that they compromise. Measuring the inlet of the manifold reveals an inside diameter of 28.4mm. In comparison the outlet of a Mikuni 30mm was measured at 29.8mm. So if you look down the barrel of a Mikuni 30mm connected to a 28/30mm Polini, you will see a lip all the way around. This is not desirable and some machining to match these up may be required.

    ./Polini 28 30mm carb manifold.jpg ./Polini manifold with mikuni 30mm.JPG

    ./Polini manifold base dimensions.jpg

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    Comments (5)
    Viewing 5 of 5 comments: view all
    #1
    keuk? says:
    Hi, i saw on a website that there is a little hollow on the side of the manifold... is there something (humpback) IN the manifold ?

    Do you know the external diameter of the manifold ?

    Thanks

    Antoine
    Posted 07:47, 3 Jul 2008
    #2
    internetscooter says:
    The external diameter is 36mm. I dremelled out the internal diameter to 30mm fairly easily.

    Yes, there is a bump on the inside of the manifold. Yes, that is undersirable but is needed to allow access to the bolt.
    Posted 21:48, 4 Jul 2008
    #3
    trevoissier says:
    I'm looking at the Mikuni tmx 27 on the sip site.
    Might this be a better fit?
    Do modifications have to be done to the fuel tap to deliver proper fuel to carbs this large?
    I'm running a p125x kitted with a malossi 166 kit, mazzuchelli race crank and a prima stainless expansion chamber.
    any suggestions?
    Posted 04:19, 29 Oct 2008
    #5
    internetscooter says:
    I would think that the fuel tap would be ok. We have no problems with the 28mm on the KDX conversion (however we haven't had it sitting at high speed for any length of time).

    The best way would be to measure fuel flow (e.g. how much time to fill a 1 litre bottle). A standard Vespa full throttle will use a tank in about 1.5 hours.
    Posted 21:36, 30 Oct 2008
    #6
    internetscooter says:
    I just spoke to a mate with a 28mm Mikuni (Pinasco 215 + JL Pipe). There are no problems with the fuel tap, but make sure you have no kinks in the fuel line. He bought high quality fuel line and special metal bendable joints that went around the hose to prevent it closing up.
    Posted 00:21, 1 Nov 2008
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