Hi all Just got my an400k5 (silver)yesterday 1-18-05and it was too late and too cold to try to ride so I waited untill today and after only 9 miles it was still too cold. noticed a few differances from the 650, it takes a few more rpm to move , I realy miss engine braking and the one that I dednot expect on the 650 I looked over the top of the givi windscreen on the 400 I look through it. The 400 also feels muich lighter and nimble than the 650, beginning to look like I made a good choice for me with my limmitations. more miles (smiles) will tell Dewight