Tim; The Speedmaster/America OEM Speedo ratio is 2240:60. I would think the 2.1 ratio speedo would be off by quite a bit. Don't know which way it would read - fast or slow.
My new speedo seems closer to the truth that the original one. When riding along side another bike it reads less than 5% slower instead of the 10% or more on my OEM speedo.
Bob
