Ok guys,
I just took out my TH-350 from the last race that I post video here since it start sliping. Truth was as Redhrart said, the governor got Stuck, but never mind I toast the disc.
I just change the whole kit, but somere I read that you can put extra disks or extra something on the gropusp t make it shift harder and faster !!!!! just dont remember where!!! 
If any of you oldtimmers can help me here before I close it up, I will realy apreciate the help.
Thanks in advance
Gabe
Need a Freakin' Roll Cage, and a Death Insurance