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  1. #1
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    One Sick 650SX... 750 Dual Carb plus complete make over

    More than anything else this is a record for myself so I can duplicate this ski in the future. I built this to sell but ended up liking it A LOT. Now that I've sold it my review will hopefully be as unbiased as possible, lol.

    I bought this ski in 2010 from the second owner who had the ski since about 1990. It was perfect but with a blown engine. It came with a copy of the original title from 1987, and the original sales receipt! With such good history I had to do this ski justice.

    I ran it first in 2010 with a different 650 engine swapped in, complete with the 28mm single carb. At the time, I thought it was a nice engine set up and I preferred it to the response of my limited 550cc with a 44mm carb. I think smaller carbs on bigger engines just have better throttle response and feel to me. This was the first stand up my wife rode, and she was up standing the first day lol. Did way better than just about any of us guys.

    I'll post more info but here's a quick run down:

    1987 650sx
    750cc engine from a 1994 750 ss xi
    custom graphics designed by me
    Dual CDK-II Keihins with my special jetting changes
    Choke eliminated, primer fitted
    750 ebox with small pin CDI
    Coffmans big 650/750 pipe
    Coffmans diverter manifold port matched to engine exhaust ports
    1986 X2 waterbox for least restriction without having to drill and make loud
    Fully machined down/ lightened SXR oem big hub impeller pitched 11.5/18.5
    Stock nozzle
    Westcoast deep scoop style intake grate
    Stock ride plate (for better freestyle tricks)
    FULL Jettrim pad set
    Hydroturfed rails, molded black diamond
    Pole spring
    lanyard start stop faceplate
    Blowsion 4 deg bars and new ODI grips
    Quick steer plate
    Rebuilt hull bearing/ seal mount

    After and before pics of the hull:
    IMG_20150905_102850937.jpgIMG_20150905_102900937.jpgIMG_20150905_102912347 crop.jpgIMG_20150905_122354231.jpgIMG_20150905_102842401.jpgIMG_20150822_134945737.jpgIMG_20150822_134941173.jpgIMG_20110709_191026.jpgIMG_20110709_191104.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]



  2. #2
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Before and after pictures of the engines.

    I initially ran this ski with the exact carbs from my Pretty Red 550/750. They matched perfectly and gave this ski really crisp throttle response. These mods are a little more extreme than I remember changing, but the ski has run flawless all season.

    Keihin CDK-II Dual Carbs
    Pilot jet: 78
    Mid jet: 50
    Main jet: 132
    1.6 N/S
    mid length springs slightly shorter than as purchased
    Low screw: 1 turn
    High screw: 1/2 turn

    IMG_20150822_090921945.jpgIMG_20110709_191133.jpg
    Last edited by theVetteman3; 09-11-2015 at 01:12 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. #3
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    In its final configuration this was a really sweet ski. I would not even consider building one of these skis without the Jettrim mats. They are such a HUGE improvement to the ergonomics of this ski. Stock this ski was painful to board and ride. It was awful. The plastic bumper on the back was hard and painful and resulted in quite a few scratched and bruised shins. The plastic grommets on top of the gunwale side pads were so sharp that they scratched too. The pole was very very heavy and the super narrow handle bars made an awkward riding stance at best. And the slow steering helped make the ski seem even more big and sluggish than it actually was.

    After the rebuild, the best thing I can say is that all the prior issues were completely erased. With the Jettrim pads it was super plush and the tray had a feel of like a high end sportscar interior. Even though the tray side pads don't have a ton of padding behind them, they were more than sufficient. The 4 deg bars and quick steer helped make this ski feel tons more nimble.

    The sxr impeller was completely machined down to lighten it, there was no cast surface remaining on the outside. It supposedly was repitched to a 11.5/18.5. This was a very good match to the power of this engine. With the Coffman's pipe it had really good low end. From 0-10mph it felt harder and crisper than 750 skis- in particular a friend's 750sx with a factory pipe. I think its the combination of the swirl, and better power/ torque per weight. The short stock ride plate meant it was super easy to slide the ski around, and it made it easy to jump. Roll up to a 1-2 foot wake just roll on the throttle and you could get the whole ski out of the water.

    I liked this overall combination much better than running this same engine in my X2 with a 650 mod factory pipe and a 9/17 impeller. That set up was more high rpm biased. The low end on this ski was pretty darn good for just a plain jane limted engine.

    With a stock nozzle this did 46.8mph on GPS. This was with a small pin CDI with the lower rev limit. With a big pin CDI and a smaller nozzle this ski would do into the low 50s pretty easily. At top speed this hull felt super stable even with the stock ride plate.

    Attachment 483610IMG_20150821_084611021.jpg
    Last edited by theVetteman3; 09-11-2015 at 01:39 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]



  4. #4
    PWCToday Newbie Dresang's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Ski looks awesome, nice work!

    I see you designed the graphics, did you also make them or where did you get them done?

    Thanks!
    Ryan

  5. #5
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Thanks man! I designed and cut them myself. I see you've got a blue pole 650sx, if you're interested in a similar set that goes with the blue on your ski send me a PM. I am going to offer these kits for sale.
    Last edited by theVetteman3; 09-14-2015 at 10:36 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. #6
    Resident Guru still standin's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Frank, glad you did a write up on this ski! I got to ride this ski before it was sold. This thing ripped! Was bar none the baddest 650 I've ever ridden, the impeller was spot on for the style of riding and bottom end that I enjoy. It has convinced me that I need to buy a big hub swirl for my 750sx. (Im thinking a 9/15 hooker or something similar is in order for next season).

    For all of the bashing that the 650 hull takes and being branded a "turd Ski" I have to say that this thing had non of those characteristics and felt much much more nimble than a SNSJ. (Yes I realize the SNSJ guys will disagree with this comment, its just my experience and opinion)

    Really the only thing I would have changed on this ski would be a shorter handle pole I really think it would carve nice if I could get farther forward in the tray, but his could be just my bias as i'm running -2 to -4 inch poles on all my stand ups and have gotten used to that.

    Oh and I would have had a thumb throttle! Triggers are for guns get that thing out of here lol

    One look at this ski and you can tell it was built with precision and care in every step! Excellent build!
    -Bulldog Freestyle 550/750 - http://www.pwctoday.com/showthread.php?t=457962
    -92 550sx/650 conversion
    -94 750sx modded
    -86 X2 - Twin carb 750 swap

  7. #7
    Resident Guru bored&stroked's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Dam, I NEED those graphics, well done!!!
    '90 Superjet: ported 760, dual 44's, B pipe, ADA head 190psi, TDR waterbox, hooker 10-16, sponsons. Girlfriends ride
    '94 Suuuperjet: 718cc, pro tec pipe, Groupk head 175psi w/protec girdle, protec ride plate, MSD coil, UMI grate, Roundnose pole -4", rev footholds, sweet green turf and wrap.
    '95 Raider 701: Fiberglass not SMC, Hydrotrailer hitch, ugly purple and yellow everywhere.

  8. #8
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Thanks! I am still sad to see that 650sx go. I tell you, those decals made a huge difference.

    Thanks for putting down your thoughts Ed! I must say whoever came up with the turd ski idea clearly hasn't been on a range of skis with mods. I'd like to say that I'm pretty unbiased. I mean my primary riding ski is a 09 SJ. We had some friends out a few weeks ago. One guy was on my brother's stock superjet and was watching me jump off my own wake. You know, where you loop around and do a few 360s and then jump it. That's how I was jumping with my 09 when my avatar pic was taken. I can get that ski nearly entirely out of the water, which off my own wake is pretty darn impressive for a stock ski. The 650sx could easily do the same thing. He was wondering why he couldn't do it on the SJ. I said here lets swap and he was immediately hopping and jumping.

    Stock to stock the 650sx and 650 SN are not all that different. Both are huge tanks. But when you start to modify both that really changes. I think too many people jump on the "buy a superjet" band wagon before they really see what Kawasakis can do.

    To each his own and mods make a huge difference, but the last day out the 95 SN was the turd ski by a significant margin. My brother has been keeping that ski stock because his GF likes riding it. She's recently progressed enough that he's thinking about doing a few mods. Bars, quick steer, and impeller. With those mods I'll have a better idea if the "turd-ness" of that ski shrinks equivalently as the 650sx did.
    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. #9
    Resident Guru bored&stroked's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Quote Originally Posted by theVetteman3 View Post

    Stock to stock the 650sx and 650 SN are not all that different. Both are huge tanks. But when you start to modify both that really changes. I think too many people jump on the "buy a superjet" band wagon before they really see what Kawasakis can do.
    The 650sx always feels like a tiny little rail when I get on it after riding the square nose around all day. It feels light and narrow. Superjet turns 100% better, there is NO comparison in turning ability. Yes you can make the 650sx have power, but feel like a superjet[not talking power]? I've never felt it....
    '90 Superjet: ported 760, dual 44's, B pipe, ADA head 190psi, TDR waterbox, hooker 10-16, sponsons. Girlfriends ride
    '94 Suuuperjet: 718cc, pro tec pipe, Groupk head 175psi w/protec girdle, protec ride plate, MSD coil, UMI grate, Roundnose pole -4", rev footholds, sweet green turf and wrap.
    '95 Raider 701: Fiberglass not SMC, Hydrotrailer hitch, ugly purple and yellow everywhere.

  10. #10
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Agree to disagree? I guess in my book being light and tiny is how I want my skis to be. I can't see how a tiny feeling ski can't turn unless you aren't leaning over and carving on a Kawasaki. That's the advantage of all Kawasakis and I really wonder how many SJ riders "get it." So many are stuck riding flat because that's what SJs do.

    Our bone stock 95 doesn't steer that well, at all, under any condition. Combination of mild steering plate location I'd say. I've been on a rn with a quick steer and it was tons better, and how I expected SNs- Pre 08s to handle like. You could basically turn the ski flat perfectly. Our SN feels big, large and lazy. Stock wise it leaves a lot to be desired, that's what I'm getting at. I know they can be modded to hit like a ton of bricks, but if you put the equivalent amount in a Kawi, especially a 650sx, you could have a sick little ski too. Although the absolute low end would probably still be less, a combination of the 650s smaller pump and (most likely) lower port timing engine.

    As a brief caveat, my brother was really railing some high speed butt drag turns on the SN. I had no idea how he was able to carry speed through the turns without the thing cavatating up a storm. So it can be done, just the hull isn't suited to it well stock at least. He needs an intake grate on that thing. Which highlights the point I'm making. A stock SN really isn't anything that's all that great compared to Kawasakis with any significant mods. Which perhaps isn't fair to the SN, but it's my thoughts based on the skis we've got out. However, now that my brother's GF is getting more comfortable with this ski, he's going to start doing a few mods to get more out of it.

    One thing I could feel though which is the big key in my book, is the more immediate low end thrust that the 650 hull has vs the 750 skis. Stock 750s with a factory pipe just don't have low end. This 650sx was really good. Very easily a better wake jumper than most 750 hulls I've been on in any state of modification. The only reason I can think of for this difference besides the impeller would be the lighter weight. Since the whole ski is lighter the 140 pump will kick harder.

    But seriously, to anyone with a 650 or 750 ski looking for low end, a swirl impeller is a must! If I would have hung onto that ski I would've really like to try a hooker impeller. Next time around I'm going to build a similar ski but with a freestyle ported 750sx engine.
    Last edited by theVetteman3; 09-25-2015 at 07:03 AM.
    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]



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