majesty engine noise 2.mp4

My Yamaha Majesty 125 has very strange noise. The parts inside the engine and the transmission were checked. The piston, the v-belt and the clutch weights were replaced. However, the noise is still the same and I have no idea about that noise.
Does any body know? please give me some advices.
Thank you.

[cuteo]

Dear friend,

I have fixed that noise completely. I don't know exactly about your case. However, I have some idea that you should check the cylinder (if it is so worn) or the piston is placed upside down.
Hope this is useful for your case!

[marcinkoziel]

Hello how many rotary screws set the fuel mixture air?
Thanks

[lorandaaa]

i have a mbk skyliner 125cc 2001 and my crank shaft replaced and since i have the same iritating motore noise i have no idea why, if u have any ideas or got response to fix pleas pm me, thanks