Yamaha r6 does not take gas or rotate over 1500

Servus people I have the following problem for 2 days, when I wanted to start driving my r6 (rj03-99 year of construction) went out directly after a few meters, then you went on again and then only push through half-lived, the whole then no matter how much gas I gave only in the range of 1000- 1500 revolutions. I then dismantled everything, installed new spark plugs and assembled again, then it went on the test short quite normal. everything again and the same problem until the Bat I tried it again yesterday and it was like that again, start and it went, I changed and wanted to turn a round and it remained hanging again at 1500 revolutions. I then dismantled the carburettor and completely cleaned ( 3 out of 4 of these brass nozzles around carburettors were almost completely too) I put everything back together this morning and then had the stand gas too high, when it went on everything wonderful she turned only directly up to 6000, again out of the and the end of the song is that you didn’t want to go over 1500 again. I almost did it like that (with a hand permanently brought on the gas to 80°C but it didn’t improve anything. so if I don’t give a gas you go out, if I give full gas happens nothing, the rope doesn’t hang and has nothing to do with the shock was not jammed or anything else. what do you mean the whole thing is ? is somehow the fuel pump down or maybe the fumes, which other res doesn’t really come to mind anymore. have the little one for about a month, she has something about 47 K on the tacho and I drove with her now to the 850 km without any problems. am grateful for all tips and tricks.