my 95 f3 has 138's and 140 jets as well.. i just got done fixing my flat spot that hovered around 6k rpm's.. had to strip the carbs down, clean them thoroughly, set my mix screw at 2 turns out. my needle and seat is aftermarket and is adjustable, i set it at the 2nd slot from the end. and synced the carbs.

flat spots gone. syncing the carbs when you take them off, is a must.

 

thanks,

everthing is ok, thats whats bothers me, how can it be so rich?
i also live at sea level.
any clue?

 

That plug confirms a rich condition, change them, then recheck.

 

update
so put in new plugs and ran like new, put on it around 100 miles and today riding on the interstate, doing 140-180 kph got off, and the bike was just vibrating in lower rpm as if it lost a cilinder, tank was full, pulled the plug off and it seems fine, any idea?

 

Reading plugs is an art' like photography. Your most accurate "take" is to freeze the moment. Your ride warmed the bike up nicely, but at some point you let it idle which can cover up the real reading.

I know, hard to do on this bike, but ride it hard, hit the kill switch, pull the plugs one by one and note their color. This will tell you which cylinder is misbehaving or if all are misbehaving.

However, your symptoms seem to match mine which was a low rpm lean condition. I rebuilt the whole carb stack and it runs fine now. Trouble spot for me was the pilot jet.