Originally Posted by Max...
Weight distribution is the key to stopping this - mine does exactly the same if it isn't right - lots of previous topics on this (you get a sort of 'bubble' of air under the boat that moves back in waves). We found by gradually moving people or weight back slowly it disappears altogether.
Weight forward to get on plane then back to eliminate the flexing. Lovely once you have it sorted. Make sure air floor is to max pressure with a guage first.
Thanks mate... it was offputting at first...especially when the missus is in the boat ready to panic at anything possible...
I do check the air pressures every time before a trip out... I will try the weight forward then back trick...but think I may have to adjust my trim first.
All a bit more sensitive as I know I have a 20hp 2 stroke sitting on the 340.. ;-)