Bike turns over, but will not start
I have a 2001 Vulcan 750. I just did an oil change on it. I used mobile 1 fully synthetic. Within a couple days I started hearing a sort of SHH SHH SHH sound in time with the engine. I wasn't experiencing any loss of power so I was going to wait for my weekend to take a look at it. My weekend starts tomorrow, but my bike died on me halfway to work this morning. Thankfully I live close to work and was able to walk it back. So it started to die on me at a stop light because I'd forgotten to turn on the fuel valve. Once I do that, it normally picks back up. It died a couple times and I could get it restarted, but once I let go of the clutch and gave it some gas, it'd die again. Now it attempts to turn over and sounds strong at that, but will not start at all. On a side note, from time to time, maybe once every 3 weeks, when I turn off the bike, the petcock will leak for a few seconds and then stop. Not sure what's going on with it. I am very mechanically inclined and would prefer to repair it myself. I was thinking to switch the oil again as the problem started shortly after, but wanted to get some other rider's opinions on the probable cause. Any ideas?
Thanks in advance!