I have the 240 EFI M2 engine in my Seadoo Utopia jet boat. It runs great, but it smokes like crazy! I did a compression test and the 1,3 & 5 cylinders are on average 135#, the 2,4 & 6 cylinders are on average 125#. I think the port bank is a little low, but I don't think it would be the rings...
