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  1. #11
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    Yup to everything. I have my sources for good info, you'll see.

    I know of the front sponsons you speak of. Actually the guy I got my hood from has a set. I'm not sure if I'm going to go that route or Blowsion Destroyers like my brother (topnitroracer) did. Those are massive and had a pretty massive impact on handling. For those who haven't tried them, they make the ski feel about a foot shorter, and the steering is much more sensitive. It basically feels like half the steering input equals full lock as it was originally. Carving does get better too. The first time I was on my brother's ski I was shocked. First turn and it pitched me off! High speed stability was hard to get a handle on, mostly because he was running a D cut stock ride plate for tricks and such.. lol.

    As far as hull extensions, I've found since I'm on the lighter side even just long ride plates have a real good impact. I ran the long TT Jet Dynamics plate and my ski was planted. Next year I'm going to run the R Pot plate and see how that goes.

    Quote Originally Posted by ImpactSportsTV View Post
    First and foremost, I agree with you that the SXI Pro can be the best ski for laying over a carve that has ever been made. But, unless your goal is a pure freestyle ski (not what I read with a goal of 60mph) there are two handling components that should be mandatory to your build: hull extensions and small front sponsons. They are the key to making a very good ski a great ski. I have previously owned an SX, a SXI Pro and an SXR, and I can tell you that the improvements to the SXI Pro in minimizing porpoising, improving stability at speed AND improving carving hold and feel shouldn't be underestimated. For front sponsons, it isn't necessary to go to full-on tubbies, the ones I had were designed and installed by the factory Kawasaki team at the end of 2002 and were replicas of their race skis. They were less than an inch thick and really were a noticeable help with stability and carving. Unfortunately, I can't post pictures as my ski was sunk & lost in 15' surf off of Oceanside a few years ago (a sad day). Search for pics of the 2002 Kawi team race skis, you won't find better ones than those.
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  2. #12
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    Bruce I'm not sure how your fleet looks and if you have anything close, but for me personally its a great ski, especially for the money. I found I wasn't using my 800 I built up last year (dont ride the xir much), so I bought a ski specifically for that engine. Between the ski and the hood, and all the black goodies I could have bought a sxr. For me personally this is the best ski. And I like going counter trend a little. Not too many guys are building sweet pros which means you can fly under the radar a bit and get good parts. Also with a few choice mods it can be significantly lighter than a sxr. I like lightweight skis.

    Obviously if you can, find someone near you with a limited one and see what you think.

    Quote Originally Posted by Bruce in SB View Post
    Well ... I guess I better get one ...
    Last edited by theVetteman3; 10-16-2012 at 06:01 PM.
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  3. #13
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  4. #14
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    Pipe comparison shot

    2012-08-01_17-33-56_820.jpg
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  5. #15
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    This is something I've been digesting for a little while. I need to compare each and take some pics. Quote comes from about 2/3 down the page. The guy doesn't use real technical jargon which makes it difficult to decipher what part of the hull he's talking about. Is the SXR bottom not concave straight back to the pump? If that is indeed an issue, seems like that would be an easy fix.

    One of the improvements Kawasaki really wanted to make was to minimize the porpoising effect that the SXi Pro was notorious for having. With a minor change of the tunnel leading to the pump, that mission was accomplished. The SXi Pro’s tunnel ran from the front of the boat to the pump. With a reduced length of this tunnel — now it starts about midway back on the hull — the reduced size of the air pocket reduces the amount of hull slap that the SXi had, and it also allows the driver to position the nose correctly in turns. With the SX-R’s overall width, the ride also offers much more high-speed stability.

    http://www.watercraftworld.com/output.cfm?id=146287


    Hmmm.. now that I've checked a little, I might know what this guy is talking about. Check out the pic of the sxr bottom below, vs the sxi pro bottom in post 35. Notice how the SXR below is perfectly flat at the front in the center of the hull.

    http://www.pwctoday.com/showthread.php?t=383970&page=4

    Kawasaki_jet_ski_sx_r_800_bottom.jpg

    Wow, is it as easy as eliminate some of that concavity to reduce porpoising?
    Last edited by theVetteman3; 10-16-2012 at 07:28 PM.
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  6. #16
    Frequent Poster topnitroracer's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    There is definitely a difference in the concave area between the sxr and pro. The sxr's hull only seems to be concave about a foot in front of the intake grate. The concave area on the pro goes until the hull starts to turn upward in front. It is hard to get a picture to show the difference though. What you need is a straight edge and the hulls upside down. I would think it would be real easy to fill in and shape. Not sure how much weight it would add, but for carving, some would probably be welcomed anyway.
    X-Scream Kong XS1000
    SXR
    1100 - Limited
    SXR 1100 - Superstock

    Sxi Pro
    800
    Superjet 701

  7. #17
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    We really need a spare hull so we can experiment.

    Here's a few more details on the C4 mounting. You need to run a 750sx limited pipe manifold, which rotates the pipe in more towards the center of the ski and the engine. It wont fit in the hull if you use the standard rotation type manifold.

    First three show the regular type manifold, note the bolt rotation and how the outside two are almost parallel to the centerline of the engine. The 750sx type has the pattern rotated clockwise more, bringing the pipe closer to the engine.

    2012-09-15_13-01-31_330.jpg2012-09-15_13-02-03_239.jpg2012-09-15_13-02-16_486.jpg2012-09-15_13-20-45_297.jpg2012-09-15_13-21-06_544.jpg2012-09-15_13-21-12_211.jpg
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  8. #18
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    Here are some of the manifolds for comparison. From left to right, my 750sx manifold which has been opened up and port matched and polished, opened up stock xir manifold, misc factory pipe manifold, and oem non-diverter 650 manifold.

    Oh and the last pic shows the side draft manifold from my xir pipe. That thing is the standard by which i judge all my manifolds. Its a perfect match to my cylinder. The FP mani is very close. Thanks again John!

    2012-09-15_13-14-34_686.jpg2012-09-15_13-15-15_230.jpg2012-09-15_13-15-54_515.jpg2012-09-15_13-16-22_63.jpg
    Last edited by theVetteman3; 10-18-2012 at 10:52 PM.
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  9. #19
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    And here's a couple pics of the exhaust tube. I like how the C4 pipe has the water inlet stinger on the pipe exit tube, instead of on the pipe to waterbox exhaust tube. This means you can completely fab up the tube from whatever regular tubing you want, you dont need any stinger specially welded on.

    90 deg aluminum bends and 45 deg silicone coupler are from mandrelbendingsolutions.com. The other hose is marine hose from McMaster Carr. Its very similar to the hose factory pipe has. Extremely tough and its wire reinforced. The other tube with the slight bend, right where it goes to the water box, is an oem piece from the oem exhaust to waterbox.

    I also included a couple of pics of my mount I'm making to secure the pipe to the front of the cylinder. I got some 316 stainless steel sheet to make them out of. It was real easy to make this piece and trim it to size, I used the thin corrugated cardboard from a USPS box. I then took the finished piece and flattened it, and traced it on my sheet stock. Piece of cake! Now I just need to figure out the best way how to cut .060 stainless.


    2012-10-07_15-52-16_375.jpg2012-10-07_16-12-18_169.jpg2012-10-07_16-59-48_460.jpg2012-10-07_17-00-00_522.jpg2012-10-07_17-00-09_998.jpg
    1985 JS550/800 "Pretty Red": Newmiller ported 800, SXR Mikunis, 650 PJS pipe, Rhaas 750 pump conv. w/ 11/17 Hooker [56.3mph gps]
    2009 SJ MINT:
    KP steering adaptor, bars, Worx 228 intake[45.6mph gps]
    2009 SJ:
    rebuild in process
    1987 WJ650: 6M6, JD Intake Grate, 17/20, 650sx cheater pipe[42.4mph gps]

    1998 SXI PRO:
    800 Superstock, 3DR hull mods[TBD mph gps]
    1994 XiR: 820cc, SS porting, Novi 48mm, VForce 3, Advent, PJS side draft, 13/18 swirl
    [53.7mph gps]



  10. #20
    Top Dog Virgin Air's Avatar
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    Re: 800 SXi Pro Build.. with Victor Sheldon's PV ski as inspiration

    subscribed !!!! Looks great
    2000 750 Sxi Pro. Factory Limited pipe, 40mm mikuni's, 13/18 SXR blade, Kommander head, Newmiller Freestyle ported #22 cylinder, lightened flywheel, aquavane & Worx ride plate, trued hull, AC handlepole. 51.8 mph

    1995 750 Sxi. stock

    1993 550 Sx. PJS intake & 15.5 skat.



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