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Okay so this is a really dumb question but I am at a loss. I put my 1991 js440 and i started it in the water and it was running fine. But the question I have is that does the water that cools the motor come out the front side or out the back by the exhaust?

If i have a Yamaha 650 motor from a older sit down will that bolt into a older super jet hull?

i just bought a 1991 js440 stand up jet ski. and i was wondering how indepth it was to do a 650 swap. i know that a 550 with just about bolt up. another question that i have is that would the extra hassle of the 650 swap be worth the extra power gain, or should i just do a simple 550 swap? any...