From a press release:

Graves Motorsports Slipper Clutch Now Available For The Yamaha YZF-R1

After fours years of development, the Graves Motorsports Slipper Clutch is now available.

Final revisions were completed and tested on the Graves Formula Xtreme Yamaha during the February 12-14 AMA Team Test Session held at California Speedway in Fontana, California. The test results were excellent, resulting in Damon Buckmaster setting a new Formula Xtreme lap record. The slipper clutch worked flawlessly, living up to the stringent requirements of Chuck Graves, President of Graves Motorsports.

“When it comes to the development and testing of high performance parts, you can’t leave anything to chance. The test results were excellent, and I couldn’t ask for anything better!” said Chuck Graves.

The Slipper Clutch will be available through Graves Motorsposts in limited production, and will retail for $3500.

More information is available from www.gravesport.com.