You could have a blown head gasket based on the sweet smell observation. But also sometimes bad gas (from sitting around too long) will also get a weird kind of sweet smell.
Best bet would be to have a mechanic check it out to be safe.
I have come to terms with the possibility of dying while riding, life has a 100% death rate. I would rather live having fun and end up dead in a motorcycle crash than never do anything fun because it's dangerous and I might get killed. No one makes it out alive anyway. - From a friend on another forum, used with his permission.