Not sure about the 09's. But i have owned an 11 assault, a 13 Pro Rmk, and have now went back to a 14 sno check assault. Top speed on my 14 is somewhere between 90-95mph. Probably 7-8 moh more than my 13. On the 14, belt will actually make it to the top of the primary where as on the 13 the belt would only reach about 3/4.
My 2013 RMK Assault top speed is 83 mph on had pack