Thread: 720 direct replacement for 657x?
09-15-2011, 12:33 PM #1
720 direct replacement for 657x?
I am looking at buying a 95 SPX (657x motor) that is seized and was wondering if the 720 is a direct bolt in replacement? Meaning same electrical box and everything?
09-15-2011, 02:25 PM #2
09-15-2011, 09:56 PM #3
09-17-2011, 11:45 AM #4
Ok thanks everyone. I found a running 657x I might just get and drop it in. The motor in the ski is locked up. The previous owner said he flooded it and removed the water the best he could. Then it froze. So I guess start by taking the head off and seeing what's going on?
09-19-2011, 06:55 PM #5
- Join Date
- Jul 2010
[QUOTE=WOT 88;1803225]This is a 720 motor running on 657 electronics out of a 94 SPX. Ski originally had the DESS style system, prior to converting it to the older style. Yes it will work. This was it's first fire up after rebuild.
Doing the same swap right now
09-22-2011, 03:47 PM #6
BTW I took the head off and the pistons are rusted solid to the cylinder walls.
09-22-2011, 04:13 PM #7
09-30-2011, 04:59 PM #8
- Join Date
- Jul 2011
Are you getting a good deal on a 717 seen complet ones go for 500.....The seadoo repair manuals are online PDFs had mine out in an hour. First one I ever seen first day I had it home. I Turned a wrench or two. Disconnect and remove battery first. Mark motor plate around the washers with a sharpie , leave or mark any shims to get alighnment back.. Get the partail gasket kit. Some permatex ultra silicone, redo all gray fuel feed and return hoses with black automotive type while it's out. Skip vent system.
Always a good ideal to rebuild carbs & fuel pump. Utube vids and manuals online as well.
It's probally the easiest ski to do.
03-23-2012, 10:22 PM #9
- Join Date
- Jan 2012
Did you end up doing the swap?
03-24-2012, 10:05 AM #10
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