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Thread: Twin dellortos struggling past 3500rpm

  1. #1
    Tyre Kicker

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    Twin dellortos struggling past 3500rpm

    First up is engine spec.
    1720cc
    244 cam
    accuspark blue coil ballast and vacuum distributor
    accuspark plugs

    twin 40 dellortos
    choke 32
    mains 140
    emulsion 777.5
    air corrector 110

    thats all info I have at moment.

    engine starts no problem, pulls nicely and and feels good up to and sitting at 3000rpm.
    start pulling past it and I get hesitation and stuttering, having to back off to about 2000rpm to let it settle and then it will sit at 3000rpm again no problem. Try pulling past it and it will repeat.

    facet pump with king filter pressure was at 3psi. Increased to 4 psi and no change.

    any opinions on what it could be? Fuel starvation?
    had a read about needle valves but don’t know what size should be right.

    i will just add I did pull over on one occasion because fuel smell and fuel was dripping out trumpets
    3 and 4. Turned everything off for a while and that hasn’t happened since. Maybe stuck needle valve?

    thank you

  2. #2
    Tyre Kicker

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    Re: Twin dellortos struggling past 3500rpm

    Sorry duplicate thread

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