I was always a 250 rider, now I love the xtra power of the 400...and find I want more ....possibly cos my diet of moderns is the 300 kato. the 510 provides more in bucket fulls.. so now loving the big bores. years ago I rode an 84 cr 500 husky that was road registered, put me off big bores at the time as did all the 500 4 bangers from Honda and Yamaha...just awfull. couldn't believe how good a 250 twoie was c/w the big fourstrokes...