Gas cap vent e tank breather its ok. After alot of searching and testing i can say the problem is not fuel or engine related. Its something electric.
This morning i tried some pull in the highway. In 3rd gear she was able to pass easily 8000 rpm and then was like to be bolted on the endeavour shuttle. Waa!! Then i tried again and after 7000 rpm stumble again. Then another time and again she was pulling...
The only gear i cant reach rpm above 8000 is the 6th gear.
I replaced the alternator assembly some days ago and now its charging correctly. I replaced the plug caps too..
Can be a ignition coils problem? The coils are a pair of brand new generic coils from ebay, even if specific for this model of bike i think they can be crappy?
Ok. After alternator replacement ican say the problem is 90%gone. Now is much more sharp at high rpm, and eventually in 4 or 5 gear the engine is able, not always, to reach the redline in a sudden explosion of wild power. Sorry for my english.
I think, since the only thing i changed was the alternator, the problem is something electric.
My question is, can generic spare coils from ebay cause this kind of problem? Insufficient spark? Something similar?