I thought I would pass on to all of you who my be interested that Yamaha Corp., through their GYT-R Performance Division, has developed an AIS Removal Kit p/n GYT-5TJ93-69-00. The kit includes all necessary parts and instructions to: remove and blank off the AIS; install a YZ throttle stop; and install necessary jets and multi-positon needle to enrich the carburetor. The kit also contains illustrated instructions on how to remove the air box snorkle and drill out the restrictive inner silencer in the muffler. Retail price is $41.95 at your local Yamaha dealer. The GYT-R portion of the Yamaha Corp. website and the latest catalog I checked at my neighborhood Yamaha dealer did not have this kit listed. So, be insistant, the part number is valid, and I touched the kit today with my very own hands it does exist.