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  1. #11
    PWCToday Regular smokeysevin's Avatar
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    Re: Skeeters 550/750 swap

    Just for reference, the pjs 650 pipe I have on my 750 kawi swap uses an oddball 4.75"? (Will confirm when I remember to) Silicone coupler and it touches the hull and motor. I had to trim the lord mount on the pipe so it tucked in closer to the motor, lower the lord mount on the head pipe so it sat lower in the hull, and slightly egg shape the chamber.

    Sean

    The older I get, the more I find myself fixing things that I knew I was doing correctly at the time.



    1987 Kawasaki JankyStandup Build
    2004 Kawi-Doo STX-RXT-X Build
    2001 Toyota Tundra Basketcase Build


  2. #12
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by BLRider View Post
    Thanks for the links but for some reason there not working


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  3. #13
    PWCToday Regular
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by smokeysevin View Post
    Just for reference, the pjs 650 pipe I have on my 750 kawi swap uses an oddball 4.75"? (Will confirm when I remember to) Silicone coupler and it touches the hull and motor. I had to trim the lord mount on the pipe so it tucked in closer to the motor, lower the lord mount on the head pipe so it sat lower in the hull, and slightly egg shape the chamber.

    Sean
    That sounds similar to what I was gonna try to do to this one but I still don’t think it will work. And fog tried it on his build and it didn’t work as well.

    I can get it to fit but it will just be rubbing on the motor and hull the whole time with zero clearence


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  4. #14
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by hondamatt450 View Post
    Thanks for the links but for some reason there not working
    OK, try these:

    JS Conversion freeride ski – http://www.pwctoday.com/showthread.php?t=466927 or Google – pwctoday 466927
    Another 550/750 build – http://www.pwctoday.com/showthread.php?t=452262 or Google – pwctoday 452262
    Muffins Modern 550/750 racer - http://www.pwctoday.com/showthread.php?t=455911 Or Google - pwctoday 458911
    Bulldog 550 – http://www.pwctoday.com/showthread.php?t=457962 or Google – pwctoday 457962
    JS300 to 750 Surf Machine – http://www.pwctoday.com/showthread.php?t=456013 or Google – pwctoday 456013
    Angry Benny - http://www.pwctoday.com/showthread.php?t=429627 or Google – pwctoday 429627
    Ugly Red - http://www.pwctoday.com/showthread.php?t=306679 or Google – pwctoday 306679
    550sx/750 - http://www.pwctoday.com/showthread.php?t=347009 or Google – pwctoday 347009
    Angry Cardinal - http://www.pwctoday.com/showthread.php?t=339768 or Google – pwctoday 339768
    FOG’s 550/750 - http://www.pwctoday.com/showthread.php?t=309296 or Google – pwctoday 309296
    Goats 550 to 750 – http://www.pwctoday.com/showthread.php?t=397055 or Google – pwctoday 397055
    Conversion ski - Conversion pump – http://www.pwctoday.com/showthread.php?t=152762 or Google – pwctoday 152762
    Conversion ski 3.0 - Http://www.pwctoday.com/showthread.php?t=325500 or Google – pwctoday 325500
    Conversion ski 4.0 – http://www.pwctoday.com/showthread.php?t=436300 or Google – pwctoday 436300
    Conversion build 1994, 2007 - http://www.pwctoday.com/showthread.php?t=98286 Or Google - pwctoday 98286
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  5. #15
    PWCToday Regular
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by BLRider View Post
    OK, try these:

    JS Conversion freeride ski – http://www.pwctoday.com/showthread.php?t=466927 or Google – pwctoday 466927
    Another 550/750 build – http://www.pwctoday.com/showthread.php?t=452262 or Google – pwctoday 452262
    Muffins Modern 550/750 racer - http://www.pwctoday.com/showthread.php?t=455911 Or Google - pwctoday 458911
    Bulldog 550 – http://www.pwctoday.com/showthread.php?t=457962 or Google – pwctoday 457962
    JS300 to 750 Surf Machine – http://www.pwctoday.com/showthread.php?t=456013 or Google – pwctoday 456013
    Angry Benny - http://www.pwctoday.com/showthread.php?t=429627 or Google – pwctoday 429627
    Ugly Red - http://www.pwctoday.com/showthread.php?t=306679 or Google – pwctoday 306679
    550sx/750 - http://www.pwctoday.com/showthread.php?t=347009 or Google – pwctoday 347009
    Angry Cardinal - http://www.pwctoday.com/showthread.php?t=339768 or Google – pwctoday 339768
    FOG’s 550/750 - http://www.pwctoday.com/showthread.php?t=309296 or Google – pwctoday 309296
    Goats 550 to 750 – http://www.pwctoday.com/showthread.php?t=397055 or Google – pwctoday 397055
    Conversion ski - Conversion pump – http://www.pwctoday.com/showthread.php?t=152762 or Google – pwctoday 152762
    Conversion ski 3.0 - Http://www.pwctoday.com/showthread.php?t=325500 or Google – pwctoday 325500
    Conversion ski 4.0 – http://www.pwctoday.com/showthread.php?t=436300 or Google – pwctoday 436300
    Conversion build 1994, 2007 - http://www.pwctoday.com/showthread.php?t=98286 Or Google - pwctoday 98286
    They work now. Right on thanks. Got a lot of reading to do now


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  6. #16
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    Re: Skeeters 550/750 swap

    Well pretty productive Saturday. Traded my roommate pipes and got it mounted up in the ski. Man this thing is gonna be colorful lol. Had to chop the exhaust mount back like a 1/4” and lowered the mounting hole about 9/16” to have clearance all around the pipe from hull and the motor. Fits good. Pipe is a 3 piece Coffman from a 650sx.

    Also mocked up the west coast oversized tank and seem to have clearance all the way around.

    Thinking about adding some heat tape of some sort. Don’t want the exhaust to ruin this tank.

    How close can the tank be to the exhaust before I worry about heat?











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  7. #17

    Re: Skeeters 550/750 swap

    I dont think u need to worry about the pipe and tank. As long as its a wet pipe and you have constant flow it shouldn’t get hot enough to melt the tank.. with a B-pipe you want the pipe to sizzle water. I’d be concerned at that point!

    Do the pump conversion! You wont be disappointed. Got my 701/550/750 pump Yamasaki out yesterday and its a hell of a lot more ski then my B-piped FX-1! I do have surfjetlouie front sponsons on it and it feels very light and nimble. The 750 pump makes all the difference! My best friend has a 550/750/550 pump conversion with a 21 skat in it and its a handful of a ski but side but side to the 750 pump conversion there is a huge difference how they pull!


    Sent from my iPad using Tapatalk
    1995 FX-1: Pro-Tec chamber~Skat swirl~Pro-Tec plate~Blowsion Destroyers

    1990 Square Nose: Blue ported Jetmaniac 718~#ZERO lightened/drilled flywheel~ADA girdled/32cc~701 B pipe/flow control~Hooker 9-15~AAA pole~Pro-Tec rideplate~Tom21 Tubbies and nose piece

    2014 Super jet waiting on a B pipe and Hooker....

  8. #18
    PWCToday Regular
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    Re: Skeeters 550/750 swap

    Ok right on. And **** I know I want to do a 750 pump swap but can’t justify the price right now. Just traded a truck with a bad tranny and some other things wrong with it for a 750 ssxi and 800$. Idk if that pump will work for the swap? What’s the benefit ? Top speed benefit? And throttle response?


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  9. #19
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: Skeeters 550/750 swap

    The pump will fit the swap. I like the 750 pump in my ski as it hooks up awesome and the thrust increase is very noticeable.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  10. #20
    Top Dog FOG's Avatar
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    Re: Skeeters 550/750 swap

    There is no dispute when it comes to 550 pumps vs 750 pumps in a JS hull. Performance increase is a given. However, if there are budget concerns, I have a few thoughts.

    First, once you add up the cost of parts for the swap, don't forget to account for all the incidental expenses that will most likely arise. When I look back on my conversion builds of the last twenty years, those nickle-and-dime costs often resulted in significant increase in the final cost.

    Keeping on the topic of budget, you might consider an approach that will eventually get you to where you want to be with your ski without too much immediate financial pain. Consider working with your existing 550 pump & driveline - for now. You can get your ski on the water, with awesome performance, and acquire what you need for pump conversion over a period of time. Perhaps next year, when you have all that you need for the swap, then proceed with that portion of your conversion.

    Working with what you have, you might want to consider new bearings and seals for both the driveline bearing box and the pump, especially if their condition is unknown. There is going to be more stress put on these components with the power increase.

    Aside from the bearing/seals expense, pull the trigger on a re-pitched impeller. Nineteen and 20-degree impellers are the popular choices. If you're going to crack the pump open for bearing/seals, then this is a great time to blueprint the pump. Simple hand tools and supplies can accomplish this. You can spend a couple of hours with files and abrasives and get good performance gain with very little cost.

    Bore the pump nozzle (or get an aftermarket). I use an oscillating spindle sander to bore my nozzles. A couple of bucks for grits and nozzle - done!

    You won't be disappointed with a properly configured 550 pump setup. Low end punch is great and top speed is amazing, high 40's to low 50's. And on these skinny hulls, that's a whole lot of fun!
    I'll quit before I sit~~~

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