Article below by Racer38 (i.e. Craig) form the XR1200 Owner's Group:

Well I am going to write up my findings on the Scotty MOD with a few Photos. Scotty gets all the credit for the Research on this one. This will definitely lower RPM on the highway. At 80 MPH it should put you right at 4000 RPM.

Here are the part numbers..

• 30029-08 Rotor with Sprocket
• 40147-04 Primary Chain
• 4589 Bolt / One Time use

1. Drain out the gear case oil, I left mine on the side stand while it drained and it gets most of it out.
2. Loosen up the Primary Chain tensioner
3. Remove shifter linkage and remove the derby cover
4. Loosen up the clutch cable adjuster
5. Next I removed the clutch actuation mechanism, you take off the small spring and the locking device under the spring then screw the adjusting rod until you can remove the nut you eill need to pull the mechanism out and rotate it so the cable can be disconnected. Its kind of hard to explain but easy to figure out. Mine came out in one piece and I didnt even remove the ball bearings.
6. Remove the primary cover, no need to take the cable off just lay it on a towel and push it to the front out of the way.
7. I next removed the Bolt holding the rotor on the engine side, I used a long 1/2 drive breaker bar and to wedge the sprockets together I used a 11/32 box end wrench.
   Here is the Photo
   
   This worked perfectly.
8. Next using a set of snap ring pliers I removed the snap ring that holds the clutch adjustment screw mechanism in the center of the basket area.
9. Remove the nut holding the clutch assembly on the shaft, this is a left handed thread so clock wise removes it.
10. Now you can remove both ends and the chain at the same time, its a little tough due to the magnetic forces on the rotor side but with a little wiggling it will all come off.
    
    
    
11. Now just reverse the disassembly using the new parts.
    
    
    
    
    
    
    Bolt sequence for the primary cover:
    
    
    
    Adjust the primary chain cold to 3/8 to 1/2 inch of play.
    
    Torque Values:
    • Primary Cover Bolts 80-120 in lb
    • Drain Plug 14-30 ft lb
    • Transmission Main Shaft Nut 70-80 ft lb ( Left handed Thread )
    • Engine Sprocket Bolt 155-165 ft lb
    • Primary Chain Adj. Lock nut 20-25 ft lb