Yamaha TZR 250 - Gearbox Help !!!

[stealth001]

I started my TZR 1KT after several months on not running, the bike started great. I warmed it up and it was sounding great.
Then there was a strange clunk sound and the bike jumped forward by it self and stalled.
Then the problem happened. I thought the engine was seized, but I put the bike in neutral and pulled the clutch in and kicked started fine.
After putting in 1st and letting out the clutch the engine stalled. If you try to move the bike in gear with out the clutch engaged, the back wheel will just skid. There is no way of turning over the motor.
When you start the bike in neutral with the clutch engaged, it is fine, as soon as you let out the clutch the bike makes a sound like the motor is turning over with no compression.
Has any one got any suggestions for me?
I am willing to pay some one to fix the bike. If some one has some spare time etc.
Thanks
Deane.

[Sketchy_Racer]

unusual how you explain it.

Maybe a sticking clutch