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  1. Re: Fabricating Your Own High Performance Cone Pipe

    theres a guy on this forum that built is own centerbleed cone pipe that connects to the stock 650sx headpipe that turned out excellent. id personally love to build a chamber
  2. Re: '91 550 SX Fuel Tank Pressure/ flooding after sitting?

    the check valve only lets air in, not out. if you have a bad oring on your seat of the n/s that could allow fuel to leak past. have you checked the popoff as well? also, after riding when you put it...
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    3,209

    Re: 650sx best mods for low end

    the only way to know the actual pitch is to check it with a pitch gauge. just because it says 15 or 16 doesnt actually mean thats the actual pitch. i bought a 16 skat for a 550 and had a fully built...
  4. Re: 750 FPP limited pipe, X2 UMI steering, driveshaft

    hahaha thats fantastic! and also true.
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    6,144

    Re: Pro Watercraft pump stuffers

    I dont think you're gonna be able feel a 1-2mph increase anyways. It's not saying the stuffer doesn't make any improvements. Prowatercraft noted 2mph increase in top speed.
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    Re: js550 jetting?

    There are no interchangeable jets on the bn carbs. You can open the top screw adjuster for the pipe
  7. Re: Forgive me ... but dual cooling off the head from a single inlet ...

    If the water is moving too fast through the engine, it may not properly pick up enough heat from the engine. One inlet in and 2 going out seems useless to me as 1 line can only move so much water so...
  8. Re: Forgive me ... but dual cooling off the head from a single inlet ...

    If you only have one line going in, you should have one line coming out. That rear fitting on the head should be capped off. Everything else looks fine. If you have 2 lines feeding the exhaust...
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    Re: 550 Factory Pipe Issues

    I'd definitely pull the headpipe and make sure the water adjusters are freed and flow water.
  10. Replies
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    1,872

    Re: 550 Factory Pipe Issues

    How does the coupler look? Make sure the coupler, chamber and headpipe have no grease or oil on them. The clamps could also be worn and coming loose. Also important to make sure the chamber is...
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    9,967

    Re: Check out this cylinder failure. 720

    On break in I'd go 32:1 for the first tank. And open the screws up a 1/4 turn for the first 3 heat cycles.
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    598

    Re: dual cooling questions 550sx

    As far as can tell based on the picture everything else looks fine. Also would upgrade to 3/8 I'd pissers instead of the stock 1/4id pisser
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    598

    Re: dual cooling questions 550sx

    If you add a tee inline from the back of the pipe to the stinger and add a water bypass. That will keep too much water from going into the waterbox. Also would help to either get a flow control valve...
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    1,125

    Re: Factory Wet Pipe for sale!

    You could probably come off better selling separate since it's a total mismatch setup. But your choice good luck.
  15. Replies
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    1,125

    Re: Factory Wet Pipe for sale!

    Want to sell the chamber?
  16. Re: Tnt performance pipes vs all fraud copies

    ive had both a TNT chamber and a c4 chamber on the same engine in the same ski and the tnt pulls a bit better than the c4 chamber throughout the rpm range. TNT chamber fits better and is a much...
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    479

    Re: ISO SP 750 cylinder

    Haha awesome! Amazing what a lil modification did to that pipe. I had bend my impeller up a degree after I installed that pipe.
  18. Replies
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    2,207

    Re: Pump physics, nerd talk!

    Yes, the current 750 setup could definitely benefit from more impeller which is why I said I wanted to bend it up haha. And the porting is freestyle oriented, the exhaust ports were not raised. I...
  19. Replies
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    63,909

    Re: ***Fastest 'current' 550 in the world***

    Fish sticks and tubbies are only gonna help with cornering, not straight line stability. A longer ride plate, open intake grate and truing the bottom are what you want for straight line stability...
  20. Replies
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    479

    Re: ISO SP 750 cylinder

    I've got a stock bore #22 cylinder that needs to be bored I'd sell
  21. Replies
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    2,207

    Re: Pump physics, nerd talk!

    ive ran a hooker 9/15 in my x2 with basically a stock 650 with a lengthened westcoast pipe, and a sbn44 carb and stock nozzles and it worked pretty well. accelerated well and would go 44 mph. im...
  22. Replies
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    63,909

    Re: ***Fastest 'current' 550 in the world***

    you might want to strongly consider making some hull handling modifications going that fast haha. you are one ripple away from disaster on that thing going that fast haha. you can start with truing...
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    2,207

    Re: Pump physics, nerd talk!

    the pump cone is just a small part of the puzzle of the entire setup. if your pitch and nozzle diameter are correct with a longer cone, then the cone can hurt performance. the cone adds volume while...
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    773

    Re: Kawasaki 750 cylinders and head

    the 20 and 22 are pretty similar. the 22 cylinder has the same port timing as the sxr cylinder. if you go with the 20 cylinder, the D head will be what you want for premium fuel. im running 26.5 cc...
  25. Replies
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    2,324

    Re: Brand new Duel Carbs & Manifold 550Sx

    yeah a new set of sbn 38s which are easier to tune and offer better more reliable performance than the bn 38s you have can be had for the same price or less than your price. just because its vintage...
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    Re: Pre made front fill help

    i would think that like on the carterb rocker kits for the superjets and blasters that you actually cut out and remove the area under the front fill and glass it all back in. not glue over top of the...
  27. Re: Help Identifying Aftermarket Exhaust Parts installed on JS550

    the 650 box is also made of stainless steel instead of fiberglass
  28. Re: Help Identifying Aftermarket Exhaust Parts installed on JS550

    coffman waterbox isnt too loud, pjs, mariner boxes arent too loud either. i would go with a stock box as they are fiberglass and will fall apart over time. aftermarket waterboxes are all aluminum
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    Re: 750 cdi with timing advance

    25 degrees at 7k rpm is detonation city. especially on pump gas. exactly why the 6 degree advance plate is no good on a small pin without some kind of ignition retard module.
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    Re: X2 Parts

    well thats too bad this is a scam, my x2 needs a seat! haha
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    1,638

    Re: 750 cdi with timing advance

    thats something you might want to talk to groupk about. ive never used them for any engine work in the past. you will most likely be fine with the advance plate just no sustained WOT runs. youll have...
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    1,638

    Re: 750 cdi with timing advance

    just get a zeeltronics cdi for the 750. its a direct plug n play swap. plus you get the advantage of setting up your own custom curve for it using your laptop. the yamaha guys have been using the...
  33. Re: Can I rebuild a JS pump with SX parts?

    yes thats exactly what is being discussed here. not sure what seals youll need but with the impeller shaft OD and the housing ID you should be able to match it up. for the bearings it looks like...
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    Re: Choosing a pump TUNNEL stuffer

    prowatercraft makes a tunnel stuffer similar to what youre asking. it will help with choppy water hookup and top speed but its not going to help with bottom end. the stubby cone may help depending on...
  35. Re: Can I rebuild a JS pump with SX parts?

    you could my housing and make it work with a sx driveline
  36. Re: Can I rebuild a JS pump with SX parts?

    i have a good js housing that is blueprinted and is drilled for dual cooling ill never use again if youre interested.
  37. Re: Can I rebuild a JS pump with SX parts?

    it is different but can totally be done. youve already got the shaft so youll just need to get the correct bearings and seals to make it work. i was going to do this on my js 550 to switch to the sx...
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    Re: WTB 550 parts

    ive tried a wetwolf pump cone on a 550 pump. i ended up taking it back off because i had better performance with the stock cone. the 550 pumps are a little different, they like a lot of pressure to...
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    Re: 750sx Porting

    ive had good luck with ole newmiller. he did a 750 sp for me year before last. i did my own case porting which if i could go back i wouldve sent him the cases too.
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    Re: Twin Keihin CDKII tuning help!

    what are you using for a flame arrestor? i had a 750 in my 550 that had the dual 3 jet keihins. i ran the stock flame arrestor, removed the rubber trumpets and took 2 of the 3 screens out. i also...
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    Re: Conversion Ski

    that pipe looks familiar!
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    Re: Conversion Ski

    yes thats a nice plate however it doesnt work on a js style driveline. only works with a sx style driveline and also will not work with the rhaas conversion plate setting that works with the stock...
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    Re: Conversion Ski

    http://www.pwctoday.com/showthread.php?t=476134 here is my build thread on the conversion. theres a few pics and a brief explanation of what i did to make it work.
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    Re: Conversion Ski

    yes, my 550 was a JS. i bought a complete, non running 94 ssxi and used it as my donor ski. i ended up using the stock stainless mount and modifying it to bolt up to the stock ebox location. i did...
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    Re: Conversion Ski

    1- yes the 650 exhaust will bolt up including the manifold. to get the power benefit of the additional 100cc's, youll want a better aftermarket exhaust pipe.
    2- 750 all day. no replacement for...
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