I had a yx 160 in it for a while, 2 gear shafts later i did a swap for lifan 125 semi auto motor.
I wasn't too keen on semi auto so i decided to convert it to manual clutch, that turned out to be a nightmare. I tried everything x3 different clutches, swapped plates and springs around, i couldn't get the damn clutch to stop slipping intermittently. I soon got bored of taking the engine apart and went and bought a brand new zongshen 125cc 13hp.
The motor is in and running, now just to sort the jetting.
auto jumble end can.