'99 magna vf750c broke down mid ride

[Olson0814]

While riding around 75mph, my bike made a weird noise that I can't describe, and then the exhaust sound changed as well to a lighter, less aggressive sound.  Like a put put type sound. (great adjectives right?).  Throttle didn't do a thing anymore and the bike slowly came to a hault.  Turned it off and tried to start it again, but nothing.  The engine noise was gradually getting louder before it broke down.  I also have an oil leak coming from the front left cylinder, if that helps at all.  I don't want to bring it to a mechanic since its an older bike and not worth it to me what they would be charging.  Any help is much appreciated. 

[hootmon]

did the oil leak only become apparent after this event???
Compression test?
Some description of the noise would help..

[TLRam1]

Other then the weird noise it sounds like when you run out of gas.

[hootmon]

Other then the weird noise it sounds like when you run out of gas.

That's what I thought... Vacuum shut off valve..