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  1. #11
    PWCToday.com Is My Home Away From Home the WaTeRhAwK's Avatar
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    to use the stock 550 electrics you're going to need to replace the 550 voltage regulator with a 650 one in the electric box. also you're going to need to run a minimum of a 17 degree prop or the motor will burn even with a load on the prop. I recommend utilizing a rev limiter of some sort because the diameter of the 440 or the 550 pump is so small in relation to the power out put of that engine it's real easy to burn one when you come out of the water in the chop. the 440 and 550 pumps just weren't designed to moderate that kind of horsepower with such a heavy crank.
    Quote Originally Posted by fastlife23, in regards to MrSki View Post
    Wow ive never seen a person ask the head of a profitable well known performance shop a question and then tell them what the answer should really be.?????? I am seriously dumbfounded.

    CCC


  2. #12
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    what is the power output of the 550 (no reeds) to the 650?

  3. #13
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    PWCToday.com Is My Home Away From Home
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    I have ridden a 650 powered 550 and it wasn't what I was hoping for. You could really feel the added weight in the hull. My stock 94 superjet would blow it away at the time. But if you just want to do it for a fun project it should be cheap enough except for the proper impeller you will need to made. Scat or Impros should be able to do one for you. Prob in the $250 range. I have to admit it is a pretty cool project with parts that are readily available. Especially the 650 motors. I have a bunch of cylinders if you need one. Free. I am down for the cause .

  4. #14
    Art_Maybee
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    here is the diagram to run the 550 electronics with the 650 stator.

  5. #15
    PWCToday Newbie
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    Thanks DiReWOLF on the diagram.......

    The 650 and the 550 coupler or both the same size in diameter and tooth count. But the offset is different. The 550 is longer then the 650. Some people have said to use the the 650 and most of you said to use the 550. Whice one would be right, 550?

    Thanks

  6. #16
    use the 650 coupler coming off the crank.

    as far as props i started out with a 16-then 16.5. now i am running a 17. impros can repitch your prop.

    as far as top end this ski will pull my wifes fx1, but it's far from stock.

    ares what pipe are you running?

  7. #17
    PWCToday.com Is My Home Away From Home MASTER Brian's Avatar
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    Quote Originally Posted by ares650
    1) How do you think it will ride?
    2) Will it be quick?
    1)I think they ride fine, I've noticed mine likes to kick to the right pretty badly at times, but I'm thinking it has more to do with some damage on the rear section of the hull. I actually prefer my 550 hull over a 750 hull and feel I have as much power if not more.

    I added some homemade front sponsons to mine and they seemed to help a little on stability up front. I like the hull because it is very light compared to a 650 or 750. With the conversion you have as much power as the larger 650 or 750, but less weight, so that helps being able to throw it around.

    2)depends what you mean by that. Yes, a stock 650 in a 550 hull will probably be quicker and more responsive than a stock 550 in a 550 hull. I think a stock 650 in that hull propped correctly should be able to easily take a stock 750 for that matter. With that said, I think someone like XXX could build a 550 motor that would take my 750 motor in my hull. So it's a tricky area. I've also been told by someone at one of the big 3 aftermarket companies that they had a modded 650 in a 550 hull with a 16.5 prop that would wax most of the SJ's.

    Like I tried to relate in one of our PM's, you aren't going to get a 65 mph ski, just by doing the conversion. It may be possible to achieve, but it'll take a lot of work to get there. I'm planning on GPSing mine this summer, but I think it's probably about a 50mph ski with a modded 750 motor and untuned carbs. I built it more for low end and I suck at tuning carbs, so I tend to leave them rich.

    My main problem has been cavitation, so I get taken off the line if I race. after maybe 100yrds it seems to kick in and go, but at that point, it's hard to hang on, because like I said mine kicks hard to the right at higher speeds. The crappy part is it seems to throw me, when I finally start gaining on whomever I'm racing.

    When I used a stock 650 motor, I ran a straight 17* solas prop. Now with my modded 750, I'm running a 19* solas.

    Again, I hope that helps

    BTW...I added the diagram I have, which should be the same as the one already posted, although not as neatly laid out.
    MASTER Brian

  8. #18
    PWCToday Newbie
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    Quote Originally Posted by SJaholic
    use the 650 coupler coming off the crank.

    as far as props i started out with a 16-then 16.5. now i am running a 17. impros can repitch your prop.

    as far as top end this ski will pull my wifes fx1, but it's far from stock.

    ares what pipe are you running?
    Looking for one right now. I don't have one yet.

  9. #19
    PWCToday Newbie
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    Quote Originally Posted by MASTER Brian
    Quote Originally Posted by ares650
    1) How do you think it will ride?
    2) Will it be quick?
    1)I think they ride fine, I've noticed mine likes to kick to the right pretty badly at times, but I'm thinking it has more to do with some damage on the rear section of the hull. I actually prefer my 550 hull over a 750 hull and feel I have as much power if not more.

    I added some homemade front sponsons to mine and they seemed to help a little on stability up front. I like the hull because it is very light compared to a 650 or 750. With the conversion you have as much power as the larger 650 or 750, but less weight, so that helps being able to throw it around.

    2)depends what you mean by that. Yes, a stock 650 in a 550 hull will probably be quicker and more responsive than a stock 550 in a 550 hull. I think a stock 650 in that hull propped correctly should be able to easily take a stock 750 for that matter. With that said, I think someone like XXX could build a 550 motor that would take my 750 motor in my hull. So it's a tricky area. I've also been told by someone at one of the big 3 aftermarket companies that they had a modded 650 in a 550 hull with a 16.5 prop that would wax most of the SJ's.

    Like I tried to relate in one of our PM's, you aren't going to get a 65 mph ski, just by doing the conversion. It may be possible to achieve, but it'll take a lot of work to get there. I'm planning on GPSing mine this summer, but I think it's probably about a 50mph ski with a modded 750 motor and untuned carbs. I built it more for low end and I suck at tuning carbs, so I tend to leave them rich.

    My main problem has been cavitation, so I get taken off the line if I race. after maybe 100yrds it seems to kick in and go, but at that point, it's hard to hang on, because like I said mine kicks hard to the right at higher speeds. The crappy part is it seems to throw me, when I finally start gaining on whomever I'm racing.

    When I used a stock 650 motor, I ran a straight 17* solas prop. Now with my modded 750, I'm running a 19* solas.

    Again, I hope that helps

    BTW...I added the diagram I have, which should be the same as the one already posted, although not as neatly laid out.
    Thanks again.....
    So I use the 650 Coupler (whice is shorter on the or flater)

    Thanks again!!!!

  10. #20
    PWCToday.com Is My Home Away From Home MASTER Brian's Avatar
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    I was thinking you use the 550 coupler, but don't recall 100%.
    MASTER Brian

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