Hi,

My first post and hope you kind people can help.....

I have a lexmoto adrenaline 125cc and i was riding along and got a false neutral chainging through the gears and the bike bike cut out slowly as i got into gear and died. I got it home and the bolt that secures the tapit for the exhaust valve had craked in 2 so i replaced that and done the valve clearances and now it makes a low metal ting noise. No idea what it is. The bike now struggles to start it takes a few attempts and seems to be running a little rich and a bit of smoke now coming from the exhaust. any idea guys.... i checked the cam chain tension and all seems correct. heres a video.

https://goo.gl/photos/QeU5o9TeKLjLdJJK9