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650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

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  • theVetteman3
    PWCToday.com Is My Home Away From Home
    • Jul 2008
    • 3639

    650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

    This is a simple build that I have been interested in doing for a while.

    Back in 2008 right after my brother and I got our first jet skis, we had a good friend who bought a wave jammer. We didn't know what we were doing, but somehow managed to have fun and learn a WJ, sxi pro, and X2. We're into our fifth riding season now, and I still enjoy the WJ. No I'm not insane. I'm going to outline a few reasons and ideas for this build.

    Cheap. I got a Waverunner 650 LX ski, which ran, for $50 off CL. The LX uses a detuned 650 engine with WR/ WJ500 driveline parts and motor mount adapters. So basically its a drop in package into the WJ hull.

    Guests. My brother and I typically have many guests come out each year. I'd say most only come out once or twice. That is not much time to learn how to ride a stand up. If we get them on a x2, usually its help them balance, point and shoot and hope they dont fall off. The jammer is a sit down which anyone can master within minutes.

    Girls. Girls love this ski. It is easy and not intimidating. Even cute in a severely ugly sort of way. My good friend who bought one initially is now married. His wife says they will never sell the jammer. I think their GP800 is on the way out...

    Silly. I've said this before, but this is a very silly jet ski. It is so nice to have something which you aren't tweaking every second you're out trying to get that last .1mph. The handling is junk. But you learn to respect the limits of the handling and instead work with it, and enjoy it for what it is. Some of the most fun moments I've had on a jet ski was cat and mouse type "dogfighting" with my friend on his GP800 and me on the Jammer. The jammer can do 180s very easily, but is very power limited. Basically I hold the 0 to 10mph manuverability advantage. My friend on the GP had HP, speed, torque, stability, basically everything more than me except that slow speed agility. He would work so hard to out manuver me that he would have a rash on his thighs from his seat.

    I figure a little extra hp and a good impeller will take this ski to the next level. The highest performing 650 LX Group K has listed is just a hair under 45mph. I'm using that as my goal. Eventually this ski will get a big bore and porting. Figure 100lbs less weight than the LX and 45 with good acceleration doesn't seem too bad.

    I will not do a pump swap. From what I've seen on my 550/750 I know these small pumps have a decent amount to give. The jammer is fairly light and I think that helps. I'll be working with a freshly rebuilt pump, mint wear ring, and a perfect impeller to get the right hook up. Too many people get bogged down trying to get bigger pumps in this ski, and then never follow thru.

    Oh and also this ski will be getting a sweet make over to make all my newbie friends more anxious to ride it. Better vinyl and 2 color turf, think like blowsion freeride ski.

    One last thing, as with all of my builds, I will take this ski as far as I can. When I get to the "feasible limits" I will enjoy it for what it is. Even so it will still put a smile on my face!

    Got the WR 650 LX for 50 bucks, which included the engine, ebox, carb, pipe, motor mounts, and a few other bits.

    Got a 87 WJ500 delivered to my work for $300 with trailer. Sold the trailer for a quick $150.

    I've already cleaned the engine, and purchased a SJ 650 head. The LX uses a 2 piece head with a lower compression ratio. I figure since they originally matched the 650 with a much heavier LX hull which can sit 2 people, the WJ can probably take the added strain because it will be one person and lighter.

    Next up is purchase an impeller and a gasket set.





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    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1995 SJ MINT:
    Worx 205 intake [42.5mph gps]


  • gto0209
    PWCToday.com Is My Home Away From Home
    • Dec 2009
    • 4834

    #2
    Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

    sweet I like these oddball builds!
    Charlie
    95 sc yami 760
    94 blaster 1100
    97 sj

    Looking for a complete coffmans sc pipe and waterbox, pm me if you have one
    sigpic

    Comment

    • garrcass
      PWCToday.com Is My Home Away From Home
      • Jun 2011
      • 4854

      #3
      Me and a buddy where talking about how those actually might be fun to ride with more power.. he said he was watching a video of a Guy side slipping one in a river and it looked fun.. there was a chick in the 90's that did freestyle on one of those.. SBrider says paint it like a Geraph I can't spell it haha
      Last edited by garrcass; 07-08-2012, 05:55 PM.
      ( Girlfrends are cheap X2,s are expensive )

      Comment

      • cudaben
        PWCToday.com Is My Home Away From Home
        • Jun 2011
        • 2319

        #4
        Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

        i think its giraffe my macs auto spell didn't light up so i think were good with that one.
        "If it ain't broke, fix it till it is".

        "If all else fails, immortality can always be assured by spectacular error"
        - John Kenneth Galbraith

        Best x2 so far- 91 x2, 750 small pin 750, lightened stock flywheel. Msd enchancer, Coffman pipe, 8/16 c75 prop, tbm stuffer pjs RIP turn nozzle, 7400 rpms. GPS 54 MPH

        Comment

        • JSNate
          PWCToday.com Is My Home Away From Home
          • Apr 2010
          • 4227

          #5
          Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

          Subscribed!
          sigpic

          Comment

          • theVetteman3
            PWCToday.com Is My Home Away From Home
            • Jul 2008
            • 3639

            #6
            Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

            Ha my buddies was red and yellow and we called it the Angry Giraffe. It even had eyes on it at one point.

            Since mine is blue it was called Nessie for the lock ness monster. Since it was quite skanky the name became Skanky Nessie soon followed by Skankasaurus.

            Engine was very crusty but a little cleaning with Works toilet bowl cleaner made it look like new without harming the paint. Pics to come, this picture uploader blows hugely on smart phones.
            1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
            2009 1100 SJ:
            Kawi 1100 build in progress
            2009 SJ MINT:
            KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
            1987 WJ650:
            6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
            1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
            1995 SJ MINT:
            Worx 205 intake [42.5mph gps]


            Comment

            • gto0209
              PWCToday.com Is My Home Away From Home
              • Dec 2009
              • 4834

              #7
              Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

              get the mobile photobucket app, they load instantly.
              Charlie
              95 sc yami 760
              94 blaster 1100
              97 sj

              Looking for a complete coffmans sc pipe and waterbox, pm me if you have one
              sigpic

              Comment

              • theVetteman3
                PWCToday.com Is My Home Away From Home
                • Jul 2008
                • 3639

                #8
                Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                Just did I'll mess with it later.

                Here are some pics. Although hard to tell because the grime looks like it has chipped off, I could not for the life of me get this junk off without anything other than works. Even a wire brush would not even touch it!


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                1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
                2009 1100 SJ:
                Kawi 1100 build in progress
                2009 SJ MINT:
                KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
                1987 WJ650:
                6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
                1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
                1995 SJ MINT:
                Worx 205 intake [42.5mph gps]


                Comment

                • theVetteman3
                  PWCToday.com Is My Home Away From Home
                  • Jul 2008
                  • 3639

                  #9
                  Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                  Here's a couple good pics of my friend on his. This guy can muscle around a jammer like nobody's business.

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                  Last edited by theVetteman3; 07-09-2012, 10:21 PM.
                  1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
                  2009 1100 SJ:
                  Kawi 1100 build in progress
                  2009 SJ MINT:
                  KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
                  1987 WJ650:
                  6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
                  1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
                  1995 SJ MINT:
                  Worx 205 intake [42.5mph gps]


                  Comment

                  • theVetteman3
                    PWCToday.com Is My Home Away From Home
                    • Jul 2008
                    • 3639

                    #10
                    Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                    Also if someone has a pipe, head pipe, and manifold for a 650 let me know, I'm interested.
                    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
                    2009 1100 SJ:
                    Kawi 1100 build in progress
                    2009 SJ MINT:
                    KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
                    1987 WJ650:
                    6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
                    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
                    1995 SJ MINT:
                    Worx 205 intake [42.5mph gps]


                    Comment

                    • rock_smasher
                      Resident Guru
                      • Jun 2009
                      • 1083

                      #11
                      Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                      I gotta see this... 1 of those builds thats so wierd its cool-ish? lol

                      props to you for being different
                      Those who will beat their swords into plows, will plow for those who do not.

                      I got 99 sockets but a 10mm aint one

                      Comment

                      • fastgtfairlane
                        PWCToday.com Is My Home Away From Home
                        • Apr 2010
                        • 3527

                        #12
                        Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                        hahaha thats awesome! see if you can find a b pipe or something to put on it as well... i bet they will be fun for jumping cruiser wakes one
                        96 superjet- rockered, -4, wide tray, adjustable footholds, kv148 mag setback pump, skat 7/14 impeller, rrp adjustable pole, blowsion ovp steering, 62t/62t, ada head, zeel A02T cdi, dual 44s, boysen power reeds, TNT SS chamber

                        93-x2, newmiller ported SP750, milled head, R&D single 46 intake, sbn46, fpp blaster chamber pipe, hooker 9/15, umi, rhaas squirrel cage, dakine foot straps

                        Comment

                        • theVetteman3
                          PWCToday.com Is My Home Away From Home
                          • Jul 2008
                          • 3639

                          #13
                          Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                          Haha thanks guys. Yea eventually I really want to do a big bore/ ported cylinder on this. I remember hearing somewhere that Group K for some reason spent a decent amount of time working on the LX, so I think I'm going to call Harry and see what he recommends. That will be phase 2, which will be for next season. The 650 in theory with a little work should be equal to a good 701.

                          Phase 1:
                          stock engine with stock pipe
                          Superjet 650 head
                          Superjet stock carb settings
                          16/19 ish impeller
                          750 gph auto bilge pump
                          stock ebox
                          midshaft swap (650 coupler is different)
                          intake grate mod
                          pump rebuild

                          Engine has been removed. We were going to run it memorial weekend but it somehow had a spontaneous exhaust leak. It ran fine last season. Good reason to pull the 500 and do a swap.

                          32 measily hp.

                          Oh also notice my ghetto fabbed flame arrestor. Another good thing about the jammer is its darn near indestructable. Even with just the screen zip tied in place, we ran the ski hard, sometimes with even up to 100lbs or so of water in it. On both my friends jammer and my own we've run them at darn near full throttle forward, sideways, and backwards continuously.

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                          Last edited by theVetteman3; 07-10-2012, 06:04 PM.
                          1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
                          2009 1100 SJ:
                          Kawi 1100 build in progress
                          2009 SJ MINT:
                          KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
                          1987 WJ650:
                          6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
                          1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
                          1995 SJ MINT:
                          Worx 205 intake [42.5mph gps]


                          Comment

                          • theVetteman3
                            PWCToday.com Is My Home Away From Home
                            • Jul 2008
                            • 3639

                            #14
                            Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

                            Ok it has been a while since I posted. The Jammer is at my brother's house in Michigan so that limits my time working on it. I'll be able to devote some this weekend and next.

                            I have taken a bunch of time to clean and prep the engine. Carb is jetted correctly near as I can tell, for a 650sj. 120 pilot 115 main. The LX had a 115 115, mostly I would assume due to the lower compression head. I've also heard that the LX had a different ebox which reduced revs, I'll investigate that further later on.

                            Took this time to order all sorts of parts:
                            17/20 impeller for WJ/WR 650
                            650 SJ head
                            650 gasket kit
                            pump rebuild kit
                            orange fuel and primer line
                            750gph auto bilge pump with switch
                            some other stuff which isn't really important


                            I'm now slowly working on developing graphics for skis. Here's a sneak peak of my inspiration for this build, a Blowsion LWDE ski.

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                            1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
                            2009 1100 SJ:
                            Kawi 1100 build in progress
                            2009 SJ MINT:
                            KP steering adaptor, Worx 228 intake, PWR ride plate [47.3mph gps]
                            1987 WJ650:
                            6M6, JD Intake Grate, 17/20, Coffmans Sizzler [49.1mph gps]
                            1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
                            1995 SJ MINT:
                            Worx 205 intake [42.5mph gps]


                            Comment

                            • VXSXH20
                              Resident Guru
                              • Jul 2006
                              • 873

                              #15
                              Re: 650 Wave Jammer Engine Swap and novice Freeride/ Freestyle ski

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                              Looks Good, I believe ODD DUCK built a jammer with a 701 and a fx1 pump in it, here on pwctoday, It was dysfunctionally cool, I cant wait to see what you do with this,( No thread jack intended ) Goodluck!
                              Last edited by VXSXH20; 08-01-2012, 10:18 AM.
                              " It Doesn't Matter Who We Are..What Matters Is Our Plan!"

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