Dear Sirs:

Unfortunatly, here I am again.

The previous issues related fuselage possition are solved with the new location for the pressure reference tube, but I have a new problem. I hope you can help me as with the others.

Compression is excellent
Mezjik 23x10. at 7.000 rpm
98 Oc + 3% Mobil 1 rancing 2T
When cold and with choke first explosions after 4 or 5 flips, choke off and starts at 2nd flip. This is for the first start in the morning.
After that, every time start at first flip without choke
There is a long fuel line (40 - 50 cm) with a dubro valvle on it and also a filter betwen the vlavle and the engine. I know it's long, but the fuel runs and drops freely if I disconnect the line from the carburetor and several (10 or so) drops fall per second, so no problems here.

As you can see in the attached file, the plug (for me) shows a rich adjustment but you must consider both, the flight conditions and my problem:

Flight conditions: I hardly use full throttle, only in vertical climbs and only for a few seconds. Most of the time I use idle or high idle.
The first problem: I never could get my engine rich at high speed, It's the same what you do wiith the HS needle. 2 turns, 3 turns ... the only way to keep the engine runnin at full throttle is having the L richer than normal. As I use the idle range most of the time, the plug shows this rich condition, but it isn't like that at full throttle. I have having this problem since ever.

But now I have a new problem.
Start engine. Idle high, but ok (for me, it sounds lean). Can't get less rpm.
If I advance smothly the stick, engine dies inmediatly.
If I advance quickly to mid range, hesitates a bit and continues runnig at mid range.
If I reach full throttle, dies.

From this point, I started messing the needles. After several test, the conclusion is that behaviour does not change with the needles. It's the same what you do:
L 1 turn + 3/4 H 1 + 1/4 than
L 2 turns H 2 turns + 1/2 nothing changes.

I have cleaned the carb dismantling both covers and taking aparat all membranes in the next ways:

1 time submergin it in to normal fuel and cleanning it with a brush
1 time with my air brush
1 time with WD40 as your recomendations
1 time again the same
1 time connecting the fuel tap to a compresed air supply set at 3 kg and again with WD40

All times everythig appeared clean since the beginning.

I don't know what else can I do, but I feel frustrated. Meanly because the engine runs great (when it runs) If it was an ugly engine It would be easier for me to discard it, but I really love its power.

I want to use this engine as a "all days trainning machine". Before it, I was using a YS110, theorically much more complex engine and difficult to use, but in the practise, and after 500 flights without major issues, that engine became me used to "fly all day and forget the engine" and now I feel frustrated with my MVVS because I never can forget the engine. There is always somthing wrong. Please, help me.

Thank you very much.
Javier