Bike cutting out
#13
If nothing else cuts off id lean more towards a fuel pressure regulator. if its spitting out too much fuel than itll either drown the plugs or finally catch when its able to burn the fuel in the cylinder. Flames coming out of your pipe screams FPR! too much unburnt fuel. One sign of a bad fpr is gas in your vacuum line. id check that and replace it while your there. I only know because I had the exact same problem.
#16
#18
#20
You said your friend saw them. If you do it at night its easier to see if they are coming out lol. Mine werent noticed until i did it at night and just so happened to see them.