Looks like a centrifugal clutch to me. Very similar to the 4 stroke type. I think it might be the wet variety from looking at what appears to be a drain plug near the bottom of the main gear housing. I'm not familiar with the disassembly of this setup. Hope the above links for help given by the other members are useful.
WELL i DONT KN OW HOW YOUR CLUTCH IS EVEN IN THERE THERE SHOULD ALSO BE A GEAR BEHIND THERE THAT CONNECTS TO THE FRICTION PART OF YOUR CLUTCH MECANISM I HAVE ONE AND IT UTILIZES THE FRICTION CLUTCH JUST HAS DIFFERENT PADS IN IT FOR FULL TIME CONNECTION. LIVEFAST TOO!
The centrifugal clutch that I got from ZoomCycles came with a special 'puller'
It threads into the threaded hole in the centrifugal clutch and the end presses against the crankshaft, and as you turn the bolt, the clutch will pop off.