The 8103 handles a bit differently to the 10X, so I spent 1/2 and hour exploring and documenting the
Radio using an MC Carb. The result is the same as the 10X but it is a different journey.

INITIAL STEPS
Plug in the throttle servo to Throttle Ch-1 and the mix servo to CH 7 AUX-2.

Go to AUX-2 end points and set the values to 0% in both directions. This prevents you from accidentally spoiling all you settings by moving the AUX-2 rotary knob.

MIXING WITH THROTTLE
Select Mix -1. This mix has a 5 point curve labeled “L-1-2-3-H”

Choose Throttle to Aux-2. (Aux-2 is control knob is not used. See below when Aux 3 is mixed in.)

Use SEL key to scroll down to Point-line.

1st question is “Expo Curve”. Say yes with + or – key.

Use <CH-key to select first point “L”. Hit clear key to move graph to center line.

Use <CH-key to scroll across to select last point “H”. Hit clear key to move graph to center line.

Leave mix switch-setting = ON

The mix is now set so that you can run your engine. The mixture is electronically set in teh middle so that you can adjsut either way. Position mix arm vertically to MC-carb using guide marks on carb. Set mix servo arm to center position. You could now run the engine and set the mix values using the positions on the “point-line”. The problem is that the mix may initially be lean or rich and you will not be able to “Beep” quickly enough to adjust the mix while the engine is running.


MIX-1 OVERIDE KNOB
To help you set the motor initially AND to also give you “run time” overrides in flight etc, you can also mix another channel knob to work the mixture servo. I put this mix on a switch so that the primary mix is guarded against accidental knob rotation.

Select MIX-3 (because it has no graph.)

Chose AUX-3 Ch-8 to AUX-2 Ch-7

Turn the AUX-3 knob all the way counter clockwise. This is richening if it were a needle on a motor.

Using the + or – keys set 30% mix so that it moves the mixture arm in the direction of richness.

Turn the AUX-3 knob the other way – clockwise – and dial 30% of mix to lean the MC Carb.
(30% seems to be a sensible, “not too rich, not too lean” choice that prevents you over adjusting in-flight)

Drop down the menu and chose a switch. Mine offers Gear or Land s/w. I chose Gear lever because I have fixed gear.

Now you have a fuel mix control that will allow you to turn it on, start the motor and rotate the AUX-3 knob to richen or lean at all throttle positions.

In initial set up what I do is open the menus to MIX-1 so that I can adjust the mix graph.

Select point position 1.

Turn on the override-mix-knob.

Start the motor and move the throttle to Point-1 position on the graph. Adjust the mix with Aux-3 knob.

Then reproduce that setting with the + or – keys on the graph at the same time as backing-off the override knob position to its mid-point. Switching off the mix override confirms the graph mix.

You do this at each point-mix("1 - 2 - 3 H"), gradually going up in rpm. Then you go back to the “L” point and set the idle mix. You soon get pretty good at setting the mix with the graph-mix-function.

In normal use leave the override-mix “off”. Sometimes I use it if it is cold and the 2-c needs a little bit more fuel of if I have flooded the engine I close the mix for a few spins of the motor.

One trick is to leave the override a set a little lean. Then if the engine loads-up on the flight line I “click-in” a lean mix and then “click-it-out” when airborne.

Hope this helps.