Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
I suffered a tank slapper on my 400/4 in the early 80’s. My bike was fully loaded with a top box and two fibreglass panniers. The bike also had a barn door of a Rickman fairing. I was traveling back from Birmingham on the M40 and overtook a car on the outside lane. As I was decelerating down from 80 back to 70 the bike went into such a violent tank slapper I went straight across three lanes and onto the hard shoulder. I managed to stay on and come to a stop but not a pleasant experience. On the bright side though it cleared my constipation 😁.