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.

Well, I was looking at a new Omega Instrumentation CD I got today and
saw they had mass flow metered control units for as little as $375.  I
have no idea if the idea will work for leaning, but I thought I'd ask.

Allen

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