the backrest is removable, it pushes into holders on each side, I mounted my seat a fraction further back than I would have liked, due to an inspection hatch, so now if I tilt the engine to high it hits the backrest, a few years ago I did this not watching what I was doing and it started to lift the seat from it's mounting to the boat floor which is screwed and stuck, so I would say the back rest on mine is very strong
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