I have a seadoo 1800 jet boat it has 2, 85 HP Rotax 2 stroke motors in
it and runs about 45 Mph
only problem is it uses so much fuel you can drain the 150 lt tank in
2 hours at WOT.
I would love to replace thes 2 strokes with 4 strokes I was thinking
of BMW K1200 motors.
I think they would fit the only problem I see is a cooling system
because I use it in salt water.
also the K1200 is rated at around 150 HP so the extra speed would be
nice.

Does anyone have any ideas of has anyone tried this sort of thing ?