I used to use it in my Nighthawk a bit. The bike was pretty old and had sat for a while, enough to deteriorate the valve stem seals, so the carbs were pretty nasty. It would run but startup and even normal idle were rough at best. I didn't want to pull the carbs so I tried Seafoam, and it was perfect after that. Used 1/3 in the oil, 1/3 in the tank, and 1/3 sucked in through the carb/throttle body as directed. I would be surprised if you saw performance improvement, but it should clean things out nicely.
I think Seafoam is basically diesel fuel. There was a big discussion about this on my motorcycle board, I think it's a common thing with older vehicles. When someone brought up that it may be diesel, someone else pointed out that the service manual for I think it was marine or some farm equipment engines called for a tenth tank of diesel every so often.