Smoking and lack of power
so... just got back from a cruise. when i was about a block from home, the bike stalled on my at a stop light then acted like it was way underpowered. I got it back to my shop and it began to smoke from the front cylinder, i have an exhaust leak right where the exhaust attaches to the cylinder and from there, it looked like there was oil coming out. but the smoke was white and no blue tint. it still ran ok after that, but still smoked... any suggestions? its a 1990 vn750.