n00b here with a free but broken bike

[slakr7555]

hi everyone, i was given a broken yamoto gy200 dualsport and ive got a few questions because apparently, as ive found, info on chinese bikes is almost non-existent. i knew the bike had trans issues when i got it but my main focus was stripping all the electrical bs off of it first. i used to race motocross and i dont really like enduros what with the lights and switches and garbage. sorry. so i stripped the bike and got it running with bare minimum. once i started the bike i noticed the clutch felt horrible and i could feel first and second gear click but no action. i figure the clutch is garbage but y no other gears? i have no manual so i have no idea how this trans is sposed to be put back together and all i know is my friends neighbor who gave it to him only took off the right cover to repair the clutch bearing so the main case is untouched. either he didnt put it back together right or its missing some part or something else is broken i just dont know. anyone have pics or diagrams or a manual so i can see how this thing is sposed to go back together? ive searched and found a couple pics but they didnt help me at all. thanks everyone this bike is greek to me as im used to 2 stroke jap bikes