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I have a bit of a long question, I have a 1987 js550 and I would like to try to get more power out of it without doing a full 650 swap. I've seen different kits online for a 750 that would take it to a 840. I was wondering if something like this could be done to a 550 by boring it out. If so...

I have had this ski for 2 years and it has run great. Last season I took it out it ran fine and 30mins later would run again. This season I messed with it and it still wouldn't run. I was at a loss and one day it fired up at and ran great. I took it to the water and it wouldn't run. It's made a...