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Thread: Race X-Flow 48 DCO jetting

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    Tyre Kicker Monkfish's Avatar

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    Race X-Flow 48 DCO jetting

    I run an all-steel 1700+ X-flow with the following carb set up:

    2x Weber 48DCO 2SP
    Chokes: 42mm
    Emulsion: F7
    Main jet: 185
    Air corrector: 160
    Idle jet: 65 F8
    Pump:45

    Engine starts instantly, idles smoothly, pulls well from 2-8K and is very tractable. I'm very happy with it other than a slight misfire at part throttle on long, fast right-hand turns (not tried it on long, fast left handers). The plugs are a bit dark after a race so it's running a little rich - question is should I mess with it and try changing the jetting or just leave it alone? Or could the misfiring be be due to incorrect float levels?
    Last edited by Monkfish; 24-04-2019 at 06:56.

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    Re: Race X-Flow 48 DCO jetting

    missfire sounds like fuel surge to me, whats sort of fuel tank have you got?

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    Re: Race X-Flow 48 DCO jetting

    What cam are you using?
    You really need to know if the mixture is (slightly) rich or poor when the missfire takes place.
    Checking / setting the float levels can do no harm.

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    Tyre Kicker Monkfish's Avatar

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    Re: Race X-Flow 48 DCO jetting

    I'm using a foam-filled ATL fuel cell - I never had surge problems with the Pinto engine.

    I am going to replace the nylex plates and old o rings with proper misab plates and new mounting rubbers - doubt it will make much difference but you never know. I'll set the floats too.

    I wish I knew what cam is fitted - it was in the engine when I got it. The were pretty spendy when the motor was built - everything in it is pretty nice.

    Plugs are quite dark after a 15min race, but the exhaust is clean. I can't tell if it's lean or rich when it misfires - I hope to get it on a dyno one day once my Pinto is finished.
    Last edited by Monkfish; 25-04-2019 at 05:34.

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