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  1. #31
    resident guru explorer4x4's Avatar
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    Oxford, MS; St. Louis, MO
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    Re: Yamaha pipe question?

    The chamber I'm using on my current B1 build, a Kawasaki XiR chamber.
    Attached Images Attached Images
    SUR #52, and B1 rider
    -RN Wammer, 84mm 5mil stroker, Rickters, some carbon
    -Square Nose, 62t/62t, b1 mod pipe, Rickters, RN pole
    -JS440-750, Twin carb, JRE adapter and coupler, 650 pipe
    -B1 Blaster, 760 64x/61x single carb frankenstein
    COMING SOON- Kawi 750 equipped RN, shortened hull, B1 mod pipe, some 46's, Rickters; my new surf boat.

  2. #32
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Yamaha pipe question?

    A good friend of mine was hired by Ross to build the high volume tooling pipes,
    like the Blaster pipe.

    I used to build jet ski pipes at his shop during the mid to late 80's.

    I don't know if I can explain just how much I hate the Blaster pipe
    .
    I Built a pipe using the FPP headpipe for a super cylinder X2 mod, but
    I would have preferred to not use that headpipe/front cone.

    For that reason, I am more interested with pipes like the SpeedWerx
    dry pipe. In the pictures you can see the design features that make
    it better than a FPP dry pipe.

    Quote Originally Posted by Quinc View Post
    99.9% of riders do not have access to a dyno and professional tuning team.

    Few more threads from the X you might find interesting:
    http://www.x-h2o.com/index.php?threa...hamber.177167/

    http://www.x-h2o.com/index.php?threa...rcraft.176504/

    http://www.x-h2o.com/index.php?threa...ed-cdi.183691/
    I enjoyed the threads, especially the ones on finding a welder, and
    ignition systems.

    I have an MSD apart right now, and the digital ignition module is terrible.
    They used all the cheapest and old components possible. Including the
    old and out dated manufacturing process.

    As far as test riding goes, it's not about equipment. It is about how a test
    rider interprets what he feels and squares that to what he knows or believes.

    One of my best friends is a pipe building Maestro! He helped me out in the early
    80's when I was drawing up my individual pie pieces of the cones by hand, instead
    of cutting them on a band saw or using a computer program. Then I shaped the
    cones on my dads brake drum lathe and welded them with huge torches.

    Randy changed all that for me.

    Tim mentioned Power Pros. As PJS was having problems paying their vendors, they
    often changed vendors that would charge less or offer credit. In 1993 Power Pros
    started building pipes for PJS.

    Soon after that, is when PJS started having problems with the 650/750 2650 pipes
    blowing silicone couplers at the headpipe. Power Pros had terrible jigs, and had difficulty
    making a decent PJS pipe.

    Randy may be able to make pipes for Tim in the future, but his fee is more than most
    want to pay.


    Bill M.
    Horsepower == Speed, RPM != Speed



  3. #33
    Top Dog
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    Re: Yamaha pipe question?

    Quote Originally Posted by wmazz View Post

    I have an MSD apart right now, and the digital ignition module is terrible.
    They used all the cheapest and old components possible. Including the
    old and out dated manufacturing process.
    Can you post some pictures? Be interesting to see the internals. Also are you able to pinpoint the part that normally fails on them?
    triceps are the biceps of the back of your arm.

  4. #34
    resident guru bored&stroked's Avatar
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    Mesa AZ
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    Re: Yamaha pipe question?

    Quote Originally Posted by wmazz View Post
    I have an MSD apart right now, and the digital ignition module is terrible.
    They used all the cheapest and old components possible. Including the
    old and out dated manufacturing process.
    If it ain't broke don't fix it! Thats their motto to a T. They made their name back in the day, and haven't changed a thing since because we keep buying them. Keeps profits up.
    '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.

  5. #35
    Frequent Poster
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    Re: Yamaha pipe question?

    Read some of this pipe talk and there some things that where not addressed. 1- the b pipe has Good throttle response because it's small volume and it comes to pressure quicker giving it that spunky snappy feel. But it lacks enough volume to be a big player in the hp game.
    The mod B pipe chamber actually makes less horse power then the limited but many of racers have found more speed with it at a minimal acceleration loss to none.
    The larger dry pipes take much longer to come to pressure and correct temps to be strong on bottoms but there peak hp numbers are much better then the B pipe.
    When I first built the tnt pipe at factory pipe on factory pipe dyno we had 11hp over B limited chamber but on the water we where 1mph slower. The pipe was larger volume so slower to come to pressure so it wouldn't allow a taller prop and we couldn't get the speed back that way.
    So it's a game of how quick to come to pressure, what rpm you start to make power at and how well can you carry rpm.
    Why do gp bikes make 200+ hp at 500cc.
    Simple math, they turn 17,000 rpm and at 8,500 rpm they only make 80hp.
    How is that gonna get a direct drive prop spinning.
    When I doubt hold button till your out!

  6. #36
    PWCToday.com Is My Home Away From Home
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    Re: Yamaha pipe question?

    Quote Originally Posted by TNTsuperjet View Post
    Why do gp bikes make 200+ hp at 500cc.
    Simple math, they turn 17,000 rpm and at 8,500 rpm they only make 80hp.
    How is that gonna get a direct drive prop spinning.
    Well, at least someone smart enough to understand. It's the point I was trying to get across increase the RPM increase the horsepower like you said simple math.

    I never said anything about trying to spend a prop with 17000 RPM.

  7. #37
    Frequent Poster
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    fair oaks,ca
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    186

    Re: Yamaha pipe question?

    My Delorean put me back in time to this thread. 97 was a good year. Got my new B-pipe and learned to do b-rolls. It's 2017 and still going with just a few coupling changes.
    As said before B-pipe for rec riding and dry style for speed and racing but lot less reliable.

  8. #38
    PWCToday.com Is My Home Away From Home
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    Re: Yamaha pipe question?

    Quote Originally Posted by driftmaster View Post
    Sorry for my terminology that's how you explain rates of climb in aviation, best climb rate or the fastest climb rate.
    I was referring to V speeds in this post, you can look them up, vx and vy. Vx will get the most power in the shortest time, vy is the most power over the distance. They're described and explained in rates of climb, feet per minute. If you want to backflip or jump a wake, you want vx-power, if you want to race to the buoy you want VY power.

    In terms of jet skis, if you want to backflip you're looking for vx-power, if you want to race a closed course, you want VY power. The bpipes are vx power, limited, mod or blaster chamber. There is a 100x more rec riders than racers and they all choose the bpipe that makes less power. Make what they want and you too will be a "God".

  9. #39
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Yamaha pipe question?

    Quote Originally Posted by Quinc View Post
    Can you post some pictures? Be interesting to see the internals. Also are you able to pinpoint the part that normally fails on them?
    Here is the pictures Quinc

    Quote Originally Posted by TNTsuperjet View Post
    The mod B pipe chamber actually makes less horse power then the limited but many of racers have found more speed with it at a minimal acceleration loss to none.
    When time allows, I prefer maintaining the design configuration and build a
    new test pipe, instead of cutting a few inches out of a mid-section.

    Another example of test riders: While i was selling my line of Goped pipes,
    my top end pipe accelerated faster to a higher rpm than my torque pipe
    to a lower rpm. I knew why, but I tried to improve the torque pipe by removing
    some tuned length. That version of the pipe was terrible in my opinion and yet
    a large number of people liked it


    Bill M.
    Attached Images Attached Images
    Horsepower == Speed, RPM != Speed



  10. #40
    Top Dog
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    Re: Yamaha pipe question?

    Wazz hope you dont mind I shared your pictures on this thread: http://www.x-h2o.com/index.php?threa...5#post-1940651

    Have you ever played with the 64x ignition? Seems like it would be the ideal ignition to have if you could adjust the timing curve.
    triceps are the biceps of the back of your arm.

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