Lexmoto Adrenaline engine making rattle metal noise

[dom2cool]

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

[Zorge]

Hard to say, when you have dozen things that can rattle.

I would do some disassembly, just to be sure.

[dom2cool]

I think I have it sorted. Pulled it apart and looks like the exhaust gas valve is bent. New bit ordered so hopefully that might help

[Zorge]

Don't forget to do some valve lapping afterwards.

I don't know why, but looks to me that people lateley somehow are forgetting to do that.