Use a needle valve to change the amount of dynamic pressure
    applied to the top chamber. Just a small controlled leak would also
    probably work.

    Unfortunately this super simple scheme won't work on the Mikuni 48 mm.

    Paul Lamar ...No rotor no motor.

    Paul,
    I like the idea of a simple system, but I don't believe a controlled
    leak will work.

    An incredibly small leak will foul up a vacuum system. The worst part
    is a tiny tweak to far and the piston falls all the way causing the
    engine to
    stop. Even at high altitude I really don't want that to happen. I
    really believe
    that fuel [level] is the way to go here.
    Bill Jepson

    OK here is an illustration of such a system.


    Paul Lamar ...No rotor no motor.


Would it be feasible to use a mass flow meter with controller for
leaning these carbs via the main gas line downstream of a low pressure
pump?  Obviously both carbs would hopefully get the same stream, (or 3
if a 20B is intended).  I have no idea but I thought I'd ask.

Allen Slominski
Houston, TX

If I am going to use a mass air flow sensor I might as well go full EFI :)
I am not too happy about the price of suitable motor cycle carbs.

BTW I have given up
on the multiple hole idea in the slide throttle as I can't insure
the mixture will not screw up when the transition is made from
one hole to the next. I am back to the one hole ramp version.

Still in the running is the simple and cheap PICAXE controlled PWM
fuel pump.

Paul Lamar ...No rotor no motor.

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