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  1. #11
    Resident Guru still standin's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Well said Frank! I think I agree the 650 with added power could be a hell of a wake jumping ski especially with a drastically shorter handle pole. Id love to try a powerful 650 like the one you had with about a -4 inch pole I think it would really help with recovering after coming down from a jump. My only real complaint was I felt like I was riding at the back of the tray.

    Personally after riding them back to back. I liked the low end snap from your 650 over my 750 (which is no slouch). I thought my 750s middle and high throttle range was better, but low end snap is really what I enjoy, it was like it took it a second to really get on the power of the pipe.
    I agree with you that I think the swirl impeller was the big difference. And your thoughts on weight are interesting, do you know how much a 650 weighs by chance? I know a 750sx stock is 317lbs because its all SMC its a bit lighter than the SXI Pros which are 342lbs. I'm assuming my 750 is probably more like 305-310lbs because the stock pole and exhaust have both been replaced with lighter components.

    But safe to say that 650 really impressed me! and I WILL be purchasing a Swirl impeller this winter. I want that snap for next summer. it was really nice to have a ski with similar power to compare the old tech vs. new tech impellers back to back and see the differences they make.
    -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

  2. #12
    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

    Yea I am still bummed that I sold that ski, lol. And yea I'd definitely try something to shorten the pole next time, and make it lighter. I like the look of the stock pole with how it carries the nose piece up, so I'd probably start by working with it.

    And yea I agree Ed. There was one time I went right from the 650sx to your ski. Your ski felt way lighter and smaller, and the power hit higher in the rev range. And power was much more, I think that's down to the factory pipe being better. The 650sx had more snap right off idle and I could get the whole ski out of the water on small wakes way easier. The Coffmans as designed is really well suited for bottom end power. Peak isn't as much though.

    A 650sx weighs around the 280 mark. NADA Boat says 282lbs. And my ski due to some custom mods was probably down 5-10lbs. So the impact a swirl impeller will have will be more noticeable than on a 750 hull.

    We had an interesting day a few years ago where Adam and Bruce both had their pros out. Both had factory pipes on the engine and no other engine mods. Bruce had the stock 9/17 impeller and Adam had a 8/16 big hub (swirl I think?), a bigger nozzle, and maybe a short pump cone. Jumping from one ski to the other, Adams did have a slightly bit more low end. Like a 3/10 where Bruce's was a 2/10. Not a huge difference. That could've been more of a function of an entire engine set up which just isn't optimized for good low end. Adam's was at least 5mph slower on the top end though.
    Last edited by theVetteman3; 09-25-2015 at 12:11 PM.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.6mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [42.4mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



  3. #13
    Resident Guru still standin's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Quote Originally Posted by theVetteman3 View Post

    We had an interesting day a few years ago where Adam and Bruce both had their pros out. Both had factory pipes on the engine and no other engine mods. Bruce had the stock 9/17 impeller and Adam had a 8/16 big hub (swirl I think?), a bigger nozzle, and maybe a short pump cone. Jumping from one ski to the other, Adams did have a slightly bit more low end. Like a 3/10 where Bruce's was a 2/10. Not a huge difference. That could've been more of a function of an entire engine set up which just isn't optimized for good low end. Adam's was at least 5mph slower on the top end though.
    Hmm interesting and good to know, I'm assuming your saying the engines weren't optimized because of the high port timing on the big pin engines?
    -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

  4. #14
    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

    Yea exactly. The low end on a pro is pathetic.

    I still remember when I jumped on Bruce's pro after riding my stock 09 SJ. First I nearly fell over the handle bars from bracing against low end that never came, Lol. Then I went for a turn and fell right over because the hull didn't have the nose side pressure to pop me back up like the SJ. Those built in tubbies really work!
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.6mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [42.4mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



  5. #15
    Resident Guru still standin's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Haha for sure you were carving really well on the SJ last time out!!

    tubbies seem to be more and more popular I'm curious to see how the pump swap ski will handle being shortened and with the tubbies it has on it, I don't know the brand but they are pretty aggressive.
    -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

  6. #16
    Top Dog mattyv's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    haha Frank thats very similar to the life my 650 had...got it with a blown motor, swapped in a stocker, then it ended with a 750 with dual carbs.

    Don't knock the big pins though, mine with dual i40s, head, PJS pipe, and only a small hub ripped pretty hard on the bottom. Night and day compared to a stock pro. I always wanted to cut down an SXR impeller but sold it before I had the chance. Ever GPS yours?
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  7. #17
    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

    Ha that's funny. I bet that happens to lots of guys. I originally got that 650sx for $300, so even considering the parts I turned a pretty nice profit.

    Oh I know, I guess what I meant was big pins, in particular the aqua colored cylinders, have higher port timing more optimized for racing and its harder to get good low end out of them. My brother is running a 800 in his pro with a freestyle ported sxr cylinder, dual i40s, Kommander head, factory pipe, 14/19 c-75, big nozzle, d-cut plate, destroyer tubbies, superjet pole and steering, carbon hood- that thing has tons of great bottom end and the ski is extremely maneuverable. A well set up 750 is a pretty nice ski though.

    The 650sx went 46.8mph, which was maxing the limiter. It really could have used a big pin 8k rpm cdi. I'm making a list of all this stuff. Depending how my future ski needs go, I'm definitely going to keep this sort of build in mind. Its a fun ski you don't have to worry about your friends riding.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.6mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [42.4mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



  8. #18

    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    My very first and only 650sx hull had a twin carb 750. Naw, it wasn't the fastest thing at the lake, but probably 2nd fastest in my group of chit skis.

    It was good, but got cut up the second i got my hands on a sxi pro hull.

    I liked it since the 6 other 650s at the lake got passed and had no idea why
    1994 1100 SJ - Dead
    1996 spec hx
    "I'm going to be installing the hooker on my driveshaft in the next two weeks." -Element3488

  9. #19
    Top Dog eat wake's Avatar
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    Re: One Sick 650SX... 750 Dual Carb plus complete make over

    Great work on the decals frank, really changed the ski aesthetically in a good way!
    1995 Yamaha FX1, 144mm Pump, alum pole, TRUE FX1 B-Pipe, carbon chin pad, foot holds, hooker prop, etc, etc, etc.
    1982 Kawasaki 550- original

  10. #20
    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 Kyle. I am STILL SAD that I had to say goodbye to this ski. For the money it was such a good ski. Maybe I'll build one for my kids one day.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.6mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [42.4mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



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