I _believe_ the 02 800 is supposed to go to 8k; my 03 700 tells you either in the owner's manual or on the little picture on the belt-guard which describes how to adjust the clickers.
Each increment "should" equal 200rpm. So, if you're at 5 now, put it on #4, and in theory, you'll peak at 7800rpm.
Mine were at 3, put lower gears and a longer track on, wound up going to 5. Seems like I got about 300 total rpm out of the change.
Don't take the nut OFF the bolt - on mine, it is within a half a turn of off, but there's enough room to push the bolt out and rotate it without taking the nut itself off. There are washers in there that can fall in if the bolt is removed - so I've been told, anyway. Did not want to find out.
10mm socket + 13mm open end wrench, easy deal - I did it in the parking lot after putting the new (lower) gears in. Seems to me that clickers are a BIT of a band-aid for correct clutching, but who knows. I only needed 2-400rpm, they did the trick for me.
All that said, 8k does not sound all that wrong. Maybe try moving them to position 4?
Iain