Bang sound from the engine

[scorpblast]

Hi all,
This is my first post, I have had my 2005 Blast or about 3 months now and every thing was fine and I loved it, I bought it with 8500 miles and put an additional 150 on it. While running it would occasionally misfire when cold but ran perfect.
Until today. I had a hard time starting it and when it started it idled rough. I thought it would smoothen out, but it ran really and would misfire will on and off the throttle. I stopped for a while got it started again and while feathering the throttle A loud BANG sounded from somewhere in the engine and it died immediately.
Now it doesn't start, everything looks fine and I cant see any leaks. When I press the starter I can hear a whirring sound but it does not crank.

Any thoughts of what happened

BTW the bike has an exhaust and K&N filter.

Thanks in advance

[ztied]

Try changing the plugs.Sounds like they are fouled out.

[ezblast]

Das Boot!

[scorpblast]

Well, had a good look and ztied you are right. Somehow the spark plug unscrewed itself and popped of. Installed a new one and it works fine now

[ezblast]

[up]Always good news!
EZ

[ztied]

Cool,Glad it was a cheap and easy fix.

[scorpblast]

Man I thought it running lean and my burnt a hole in the piston.
good thing it only cost $5.
How did the plug become loose now thats another question.

[ztied]

Preveous owner may not have tightened it good.I usually go hand tight,then just a little more.Just don`t tighten it to tight,it will be hell to pay,when you gotta change it next time.