I am assuming there is counterweight. So the force on the clutch disc will increase with RPM. When I do the burnout, wet tires, raise rpms to about 6000 then bring the clutch pedal up fast. I spin them at about 7000 for a 4 second count. (29.5 inch tire). Also, I think the trans will last longer if you do the burnout in 2nd gear. 3rd is the weak link. Jerico suggested 4th gear burnouts, but I don't like loading the clutch that much. Just longer in 2nd

I hope this helps