Yesterday I started to start the bike and being a bit colder the bike did not start on the first time, so while trying to start I twisted a bit more gas and BANG!!!. Helluva loud noise coming out of exhaust.
Now I’ve had some noise coming out of exhaust before, but this was ridiculous, loud like a gun shot. I even looked behind to see if any window had broken 
Ever happened to you??
Yup.
Problem is, there are so many things that can cause this. Well, sort of. It’s usually unburned fuel/vapour in the silencer being ignited.
But why is the fuel/vapour there?
Used to get this quite regularly with my old Virago 750. Happened once with my Bandit as I was taking the fuel tank off. That was unexpected, a big shock, I was totally convinced I was being shot at. Not sure what caused that one.
Happened on a friends Deauville several times. The culprit was the battery, only just had just enough power to turn the engine over.
We always thought you might have secret friends with Deauvilles;)
yep, i had that once on my fazer, i went to start it and it went bang, i jumped out of my skin thinking id blown the engine up or something lol…
standard on carbed Harleys and Buells 
