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  1. Replies
    4
    Views
    881

    Re: horsepower js550

    X2 on the engine swap, most effective way to increase HP
  2. Replies
    9
    Views
    1,028

    Re: Best Mods for a js550

    I've had good luck a light port and polish, it's a bit of work but if you take the time you have have decent results which don't affect reliability of the motor. I found all the specs on here. An air...
  3. Replies
    7
    Views
    1,406

    Re: WetJet 428 L/C Restoration

    That duffle bag is cool lol
  4. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    A little late on the update...the ski was fun , the install was fairly easy, with the rhaas kit everything pretty much bolted right up, I did run a two in rear exhaust, and it did interfere with the...
  5. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Well I finally got to get the ski out a few times and get the bugs worked out. I forgot how these skis handled. I spent too many years on a superjet. Ski runs great, I feel the Yamaha motor is a big...
  6. Replies
    2
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    1,216

    Re: JS550 to 750 Rear Exhaust Conversion

    I did a rear exhaust on my Yamaha conversion ski, I stuck with 2 inch all the way, I used an older seadoo XP waterbox which is 2 in outlet as well. I used some abs pipe for the thru hull exhaust. So...
  7. Thread: Js440/701 build

    by jetbum
    Replies
    21
    Views
    4,094

    Re: Js440/701 build

    I thought about doing that as well. I just used to stock 550 line on my ski. It's a stock 650 for now and I will see how it goes
  8. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    I used a seadoo waterbox out a 650xp, gas tank isn't really permanent yet. I experimented with a 10 liter water tank, it's been holding gas so far, the 550 tank was in rough shape and the front...
  9. Thread: Js440/701 build

    by jetbum
    Replies
    21
    Views
    4,094

    Re: Js440/701 build

    Good luck with the build. I just finished the install with a 6m6 motor, straight forward with the rhaas kit
  10. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Quick little resto on an old shorelander trailer. Now it's finally ready for a test ride.557749
  11. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    I had to buy a bunch of parts and a rhaas conversion kit to properly install everything. I used a waterbox from an early 90s seadoo XP. It has 2 inch outlets on it so it's a full 2 inch exhaust all...
  12. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    That pipe that was on there was the tail one from a JS 300, it was just shoved on there it didn't even have a coupler holding it together. Pics show how poorly the install was.
  13. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    You will need to upgrade to a 550 pump, this hull was a 300 hull as well, the 440 pump can't take the extra power of the bigger motor. Rear exhaust is a fairly easy conversion, there are a few...
  14. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    A few answers for you. White paint is actually tremclad applied with a foam roller. If you take your time and thin it you can get a smooth finish with no drops and runs. Rest is done with a spray...
  15. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Here's a better pic
  16. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Thanks, I like the way it looks. I used two layers for the good seal, pretty much sits flush with the edge
  17. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Well pretty much got everything finished hoping for a water test very soon557523
  18. Thread: 1100 in a 300sx

    by jetbum
    Replies
    14
    Views
    1,830

    Re: 1100 in a 300sx

    Why not put a Yamaha motor in it, you will have a lot of motor options. Look at what all the pro freestyle boats use. Will be a lot more money to invest tho, just my opinion
  19. Re: Smokeysevin roll's his own swap adventure (Critical Failure) 1987 JS550 to 750 Bu

    Good work man
  20. Replies
    23
    Views
    2,248

    Re: Conversion exhaust options

    I picked up an old seadoo XP waterbox I plan on using for my 650 Yamaha conversion ski. I'm hoping it shouldn't be any louder then what a stock seadoo is. I'm not a big fan of loud skis
  21. Replies
    7
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    985

    Re: JS hull ride plate preferences

    Seems like the guys at prowatercraft know what they are doing lol I've heard good things about their products
  22. Replies
    7
    Views
    985

    JS hull ride plate preferences

    In the market for a new ride plate, just curious what everyone s preferences are especially the conversion ski guys. I'm curious to know if anyone has tried the prowatercraft ride plate
  23. Replies
    13
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    2,092

    Re: (JS550) What Pipe Yields Big Screamy??

    You can convert it to a rear exhaust. It's a bit of work but it can be done. I'm in the process of doing it on my hull now
  24. Replies
    13
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    2,092

    Re: (JS550) What Pipe Yields Big Screamy??

    I used to run a fActory pipe half pipe and a drilled stock waterbox with a rear exhaust. Power delivery was decent and it wasn't too loud. Loud skis just echo off the water for miles. I can hear then...
  25. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Honest feedback, thanks BL
  26. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    As it sits now along with the seadoo I'm working on as well
  27. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    I know it been asked a million times, but since the pump is out is it worth doing the bonsai mod. I dont expect to see huge gains but if it's worth doing now is the time
  28. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    The pump I bought did come with a bored nozzle, I will measure it to get this size.
    I plan on cleaning up and polishing the pump, it's alot of work but I don't think it can hurt.
  29. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Picked up a 550 pump and impeller in excellent shape, as skat which will get repitched to 19 degree. I need a pump cone for it and was debating between the stock one or a stubby cone. Anyone ever run...
  30. Replies
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    3,381

    Re: Longest build ever 21 yrs in waiting

    Great work, looks good
  31. Replies
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    2,004

    Re: JS650 conversion with a 440 pump and drive

    I just bought a conversion ski with a 440 pump, advice from members was to upgrade to the 550 pump so I am lol
  32. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    I'm looking forward the ski, got some work done today ski is stripped and getting ready for paint. Did a rear exhaust conversion as well
  33. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    I would like a rhaas pump kit but it's not in the budget this year, but then again tomorrow is a new year lol
  34. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Thanks Nate, Ive been reading your guys posts for years. A conversion ski is new to me, and this ski is full of surprises lol. Ive only ever had one 550 and it was an sx. I've always owned superjet,...
  35. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Would a bulkhead support work or not worth the hassle. Anyone have a pump for sale
  36. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    Got the ski stripped and it's an old js300 ski, has the oil injection stickers on it. So it has a 440 pump in it. I'm assuming this pump will work ok for now until I eventually do the rhaas pump kit....
  37. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    I got some good laughs out of it. From what I researched I'm guessing a 19 degree impellor is what I'm after
  38. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    555279555280
    The wooden battery spacer was the best lol
  39. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Re: Conversion ski

    The cone was just shoved in the rubber cover and clamped then reduced down to some plumbing fittings and no waterbox, to the side outlet which used part of a p trap.
  40. Thread: Conversion ski

    by jetbum
    Replies
    45
    Views
    11,899

    Conversion ski

    So I picked up this ski today. It's a JS hull with a 650 superjet motor. I wasn't expecting much and that's what I got lol. Gonna post a few pics, I'm all for cutting costs but cutting corners I'm...
  41. Replies
    6
    Views
    2,565

    Re: Lithium ion battery regrets

    I had a ballistic 6 cell in my superjet and it was great, cranked over real easy, I noticed a big difference in weight, worthwhile investment
  42. Replies
    207
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    37,453

    Re: New Project, JS Conversion freeride ski

    Nice pics
  43. Replies
    425
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    81,465

    Re: "Angry Cardinal" 550/750 build

    Did you ever get that 83 hull built
  44. Replies
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    5,041

    Re: Js550 701 conversion

    Can't wait to see this, are you keeping the stock pump or using the rhaas pump conversion kit
  45. Replies
    7
    Views
    4,176

    Re: Rectifier and Speed Limiter Question

    So disconnecting the Rev limiter is a no go then lol
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