Thread: 657 vs 657x???
11-21-2007, 10:37 AM #1
657 vs 657x???
Can someone tell me the differences other than case thickness? I tried using the search function and didn't come up with much. Are the cylinders and pistons the same? Can I run 720 cylinders on them?? There seems to be very little info on any of these older sea doo engines... Are the internals the same for the 657 and 657x?? pistons, crank, etc??
11-22-2007, 12:24 PM #2
11-22-2007, 01:04 PM #3
the x motor had more agressive porting
but scraficed reliabilty
11-22-2007, 03:05 PM #4
I just finally got to messing with the boat today. 130lbs and 140lbs on 1 engine... 130 and 0lbs on the other! Cracked case??? Engine turns over though... As I get started on this project Im remembering why I stopped messing with things from the 90's! Are the internals the same on these engines??? Is the porting the only difference?? Are the cases different?? Any help would be great! Thanks guys and happy Thanksgiving!
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