Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Like Julie said the 400 is a very racey engine and likes to be revved high to get the best out of the engine & it certainly needs lots of gear changes up hills & Bends etc. Its not a bike for a Sunny Afternoon stroll , cant comment on the 550 but i have one coming soon.