Edit: - thankx guys, spent so much time raving below, only now I see the other posts.

I will get on learning, and trying for the next race, or the next ... hehe

Hey razzor.
Yes, I have this: 18T/52T and 23T/47T. Brake 18T(with rear side also 18T) and front side 26T. (as a side note, should I have changed the other pulley, the one that matchs this 26T? you know, the one that connects the belt with the front diff pulley)
I am really


See, I am not bashing the engine, even if I wanted to, ( I don't, I think the design on this machine is great, a step forward on the design used till it came out, to my knowledge) I could not, as I am a "newb" on this game.

BUT, I did try, lets see if I can do some writing ...
When I got to the track, to break-in the engine and beging tunning it, I could not start it. The CRF was new, I did not touch the needles. I did open it and flushed WD40 on the internals, and assembled it again. And I hope thats not the falty area, I did set the head screws with even presure, doing the "X", you know?
It was like there was no fuel getting to the engine. Check everything, lines, presure, tank. All good. The carb had fuel to it. The guys at the track by now come to my help. Try and try, and only after we did 2 full turns out on the low needle the engine started.
Well, I went on to break-in, did some acceleration(very mild) on the box and went to the track, to follow the manual.
BUT(hehe ) the engine would not rev on the ground. Guys at the track went on saying that it was too rich bottom. Well, it sure did sound like it, smelled like it and FELT like it, there was oil all over the place ... hehe
I did lean the low a bit, till it would start and rev, engaging the clutch and taking off. (I did try numerous times, lean, try to rev, no good - engine stall - lean, wait cool down, try again)
After 3 tanks I did start to try and bring real power to it. It did seam too rich on the bottom, still. Would go on, but after brakes it would look like a stall, but not, just a LONG hesitation to pass from low to mid(and then really rev). Clutch would engage only when engine would really rev, great sound when it did.
Ok, lean the low a bit more. But when I got to a point where it did not do the extreme bogging thing, the temps went up, to 140C !
Open the high needle, temps down, but also power. I gave up for the day.
Then, I read about the OS carb.
Back to the track I did fit an OS TZ carb on it(it's the 11M).
All that happened above did again, till I got the engine to a point it would go, but was "no power OR high temps", could not tune it right.
I did change to the CRF X-type glow plug #6, and It showed some improvement on that day. (one of the guys here said thats where I am most wrong. I should have lots of glow plugs, covering all the range. He said he has 19! plug types for his Megas. Thats where he tunes it and all... all I have are lots of CRF #6 X-Type, and #8s #7s and #6s OS ones. Did not try OS plugs)
Sunny day, was somewhere near 30C. I live 1000m above sea level, humidity was(I think) near 80%.
By then, after ins and outs, I had the G4S clutch at two threads showing on the spring nut, black nut and red shoe, all the weights on and .6 clutch gap. Minimal end play, .1.
All this time I always had a nice and, what everyone would go on saying, healthy smoke trail, from bottom to high rev. Using Byron 20%.

The next day, race day, I got to the track and was thinking I just need to set a mid term, to race at 120-130C, even if I don't have great power. Start the engine on first stroke! wow - I think he is starting to like me
No power however. Pit and lose some on the clutch spring, half a turn, as it did sound like too much slipage(SP?)
Now the engine would not start. Had to open the low needle till it did, again. After warm-up I could lean low needle, so it would stop bogging, and try to tune right. Lean a bit the high each try, checking temps.
When it was fast, as fast as the 3CTs the guys here all love, my temp went to 160C !!! Stop it ...
But that was for 3 or 4 laps only.(and the track here is THE small hehe)
So, I think ok, no harm. Open the high and start the engine again.
Would not start. Check everything, glow plug, lines, fuel, needles(open, close ... no needles!! hehe, ok, not so much), but no good, would not start. Thats when the call for the director's table came, I started to pack and go home, no race for me ...

I can't recall the settings the needles went to, and I don't think it matter really, the extended weekend I had saw all the spectrum on those ...

Friends at the track all debated about what I was/am doing wrong. But well, I can't just throw the engine to someone an say "hey, tuned that" ... thats my job, not theirs, and, as helpfull as the more sesoned ones are, they have their race to look to, they can at max give some tips, try a bit of work on my engine, here and there, but ...

Ok, nuff raving. Sorry hehe, very confusing read, yes ...

I got the OS, so easy for me to work with it ... I need to learn a LOT before I get back to the CRF ...