Yamaha KT-100 Flat Adapter Plate - Burris BMC 551 Yamaha KT-100 flat engine mount is CNC machined from 6061 T-6 aircraft quality aluminum to insure a durable product. All Burris mounts are made with exacting measurements for the best possible product on the market. Go with the leaders in the industry go with Burris!! Burris mounts come complete with all necessary hardware to bolt your engine on (chassis plate required).