Good morning to all.
I have noticed that there is a point which needs a little help to be easier to overcome: This is : how do you adjust the whole set for the very first run ?

I noticed that on most of the engines I have converted, 2stk or 4 stk, the solenoid 'curve' is very flat. That means that the gas qtty flowing will be roughly the same for any throttle aperture.
This is valid for the first hours of running, you may have to adjust the curve later.

You now have understood that the gas quantity is to be adjusted very precisely with the carb air in-flow. This is why the solenoid is used for (NO other way to achieve it by the way).

Well, here is how to do:

Start by changing the O ring gasket from the Hi needle. Any old one or Glow type, will leak. Change it, will cost peanuts.

1) you close your hi needle and then re open it one half of a turn. This is plenty enough. This gives a fixed quantity of gas to get in the carb since the curve is flattish. Turn off your ignition power supply.
2) Now, you prime your carb very generously, checking for no bubbles.
3) Turn on the ignition and put the starter to work with one hand, at the same time you will very gently move up or down your Throttle stick. Get some help if needed, to hold the plane if the engine is installed already.
At one point of the Thr stick travel, the gas input will match with the carb air input and the engine will start.
Let it warm up and then you adjust on the curve very lightly going up and down with the Thr stick.

Now if you did this and it still refuses to start. It means your adjustment was never good enough to allow a start (too rich or too poor).
You then close or open your needle by ONE ONLY click (this is roughly the same as 15% on the curve). and do it again. The engine should ignite, then it is just a matter of tuning your curve at that same Thr stick aperture.

Trouble shooting again:
* an engine which refuses any start and eventually ignites through the carb: this means your timing adjustment is wrong. Don't forget the spark should happen 28 deg before piston high point. It is easy to make it it wrong. I suggest you use a protractor to check on this angle precisely.
* an engine which stalls abruptly in full speed is probably too lean, open the curve point by a few % and run again.
* you should start at 30% Thr stick opening. not more. This is enough to overcome the internal frictions in the engine before it is broken in. It is also the easy point to get, in the middle of the curve.
* check that your Thr servo runs symmetrically ! if you don't, you will have to readjust the whole curve if you change the servo or its travel.

Hope it will help you, those systems are truly awesome and enthusiastic !