Are you a brave soul with patcence? It is possible to adjust the presure plate spring tension without taking the finall drives apart. I have done it.
Remove the seat and support bracket then the 4 bolt cover on the top of the drive housing. remove the bung plug in front where your legs are stradling the transmission. You will see the 3 fingers and under each finger as you rotate the drive drum is a bolt that is 5/16" of and inch in diameter with a 1/2" head. Turn the bolt and lock nut as to remove it. Now when you look at this you will realize that your wrench is too long. Go over to the grinder and cut it about 3 inches long. Then grind the narrow the ends of the box part of the wrench to fit. Heat up the end of the wrench that you would normally hold until it is orange hot. Let it cool on it's own, then drill a hole into it and tie a string through it. Cause if you drop it you will have to take the drive apart to get it! Turn each bolt out 1/2 a turn and mark it with some paint. Turn the drum and repeat until all three have been done. If you see a broken bolt then it is game over and you will have to pull the drive. It isn't a big deal and I have done it in an afternoon ( 6 hours) Follow the manual for taking it apart. If you don't then seals will be damaged and you wil have other problems to deal with.
Hope this helps and if you have any more questions just ask.