I think you are talking about MMI (Motorcycle Mechanics Institute).
It's part of United Technologies Institute or UTI, which also trains car mechanics. MMI has its main school in Pheonix, Arizona and another one in Orlando, Florida. I watched their thirty minute long infomercial on Speed Channel one morning. They train you to work on any two of the following: Honda, Kawasaki, Suzuki, and Yamaha; or you can choose Harley-Davidson. I think the program last about a year.