Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
One might have been a dud but both? Maybe our definitions of slow are different, when I was testing these it was back in the days of my production racing and that sort of skews your views on speed I'd imagine. Oddly I found the 250N a much better bike. The 400N even more so.
Normally all the want is to check the frame and engine numbers are what you quoted and not altered