98 cbr engine problems

lately the bike has been dieing at random moments...(seems to be after riding for a while the bike warms up starts dieing) and today i ran it to work just fine came out started the bike...a lil smoke is coming from in front of the gas tank off the motor...ok so a lil smoke no biggy it smells sweet..antifreeze...ok rev it up to get ready to take off and POOOF that lil smoke turns into ALOT and with the choke all the way back the bike is barely at 1000 rpm line then it dies and wont start without giving it throttle at full choke...any ideas on what this could be?

I'm not positive, but it sure sounds like the antifreeze is playing a fairly significant role in it... maybe a gasket went bad somewhere? I know my brother's F3 is having some stalling problems, so I am probably just mentally spent from trying to help fix that right now.