Page 1 of 2 1 2 LastLast
Results 1 to 10 of 17
  1. #1

    Join Date
    Apr 2008
    Location
    Toronto, Ontario
    Posts
    29

    650-720 engine swap

    I have had enough problems with my 650 engine. so I am swaping it for a 720. My machine is a 93xp. I have the engine it came from a 96 spx. I know the electronic box needs to be swapped aswell, so what I need to know is what electronic box do I need that will let me keep my vts working, and what else do I need to change (impeller, exhaust) and what changes do I need to make to the carbs.


  2. #2
    Master of the Dooniverse
    Join Date
    May 2006
    Location
    Schenectady, Ny
    Posts
    597
    the VTS has it's own module.

    technically you can run that engine with your box you just need to reroute some wiring to accomodate the 5 wire stator. the engine plug is different, 4 pin vs. 6 pin.

    the MPEM has no idea the differecne of the two engines though.
    Last edited by The Wayniac; 07-03-2008 at 10:52 AM.

  3. #3

    Join Date
    Apr 2008
    Location
    Toronto, Ontario
    Posts
    29
    I thought the MPEM needed to be changed because it won't let the engine get to it's optimal RPM.??
    but if it will work than what do I need to do?

  4. #4
    Master of the Dooniverse
    Join Date
    May 2006
    Location
    Schenectady, Ny
    Posts
    597
    pretty sure the rev limit is 6800 on both man.


    i have never done that conversion, but they are both single coil and they are both running 20º timing advance, so basically that's all there is.


    you will need both wiring diagrams and just route the required wires to the plus from the box using free spaces in the watertight plugs. sorry i can't give you step by step, i've never done it before. i just know it can be done. it will take work, but if you got cash to throw at it and would ratehr not dig into it too deeply you can just swap boxes and sell yours....that would be most straightforward.

  5. #5

    Join Date
    Apr 2008
    Location
    Toronto, Ontario
    Posts
    29
    What do I do about the plug from the stator?

  6. #6

    Join Date
    Apr 2008
    Location
    Toronto, Ontario
    Posts
    29
    I got the wiring Diagrams and the stator on the 93xp has five wires, and also has an Ignition Module.
    The stator on the 96spx has four wires, and there is no Ignition module.
    can I swap the stators? is there a way to wire this? or do I have to get a new MPEM?

  7. #7

    Join Date
    Apr 2008
    Location
    Toronto, Ontario
    Posts
    29
    I got everything swapped over. I used the stator and flywheel from the 650. I tried to use the carbs from the 650, and even after I rejetted them they still didn't work. Got new carbs and it hits the rev limiter at 3/4 throttle. I guess I have to do th imeller next.

  8. #8
    2Blue's BFF! dsolie's Avatar
    Join Date
    Apr 2007
    Location
    Olympia, WA
    Posts
    832
    +1
    1
    Yhea, that 650 prop is way too small for a 720

  9. #9

    Join Date
    Apr 2008
    Location
    Toronto, Ontario
    Posts
    29
    Got the GPS out and clocked it at 47MPH does that sound right?

    The engine is from a 96 spx. Should I use the impeller from the same machine, or if not then what should I use?

  10. #10
    Master of the Dooniverse
    Join Date
    May 2006
    Location
    Schenectady, Ny
    Posts
    597
    Dan, that prop should be fine. the 720 only uses a 11/22 stock and i think that 650 was even taller than that, same root. i'd have to check the blue book to be sure.

    just make sur ethe prop is in good shape. considering the shape of the 93 hull 47 isn't too bad. you could likely smooth some thigns out and hit 49 or 50 with it. the 95XP 720 is good for 51 for what it's worth.

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 1991 SC 650 engine swap
    By Jetskijunky in forum Kawasaki How To & FAQs
    Replies: 4
    Last Post: 11-08-2015, 01:26 PM
  2. 1994 Polaris sl 650 jet ski engine swap
    By QuintCudi in forum Polaris Projects
    Replies: 8
    Last Post: 08-24-2012, 06:33 AM
  3. 93vxr 650 superjet in 89 wr500 engine swap?
    By west4570 in forum Yamaha Old School Skis
    Replies: 7
    Last Post: 08-17-2011, 06:45 AM
  4. FS F/S Micro Touch Rev limiter 92-97 580 650 or 720 engines
    By CrazyClam in forum Sea Doo 2 Stroke Skis
    Replies: 0
    Last Post: 07-07-2010, 06:20 PM
  5. 92 Waverunner III 650, engine swaps?
    By Skillz in forum Yamaha How To & FAQs
    Replies: 4
    Last Post: 07-06-2007, 01:07 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •