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  1. #1

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    Why these skis run different speeds?

    Why can 2 people both buy an sho, go out on the water and run different speeds? I understand the fz is a bit faster, but why is my 2008 sho turd running 64.5 stock, and the next guy runs 67? From what I have been reading, my ski should not be this slow, but the dealer is not even interested in looking at it.

    I'm guessing something somewhere has a variance when it was built. What is it? Jet pump? Plate angles?


  2. #2
    PWCflorida.com FtLaudBlkGT's Avatar
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    I told ya Corey, I'll give ya $6k and you won't have that problem anymore. LOL

    How does your ride plate look? if it has lots of corrosion and pitting, use a scotchbrite pad and clean it. look at your prop, see if there's any damage from rocks, etc. What rpms are you at when wide open?

    Have you always run 64.5? Has it ever gone faster?

  3. #3
    Lightning Struck's Avatar
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    Break in.... Actually there's a million reasons

  4. #4

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    I have no idea on rpm. I have never hooked up a tach. Ride plate and imp look ok to me. it was a solid 64.5 ski all summer. I added a riva intake and the tj exhaust. I am now 66.5.

    I refuse to accept that " its just slower." There is a reason.

  5. #5
    PWCflorida.com FtLaudBlkGT's Avatar
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    Quote Originally Posted by Corey R. View Post
    I have no idea on rpm. I have never hooked up a tach. Ride plate and imp look ok to me. it was a solid 64.5 ski all summer. I added a riva intake and the tj exhaust. I am now 66.5.

    I refuse to accept that " its just slower." There is a reason.
    It's all relative to the rider..

    Like stated it could be a million reasons, I would do a compression check to see what they are at.

    Your intercooler could be caked with salt water corrosion as it does not get flushed when on the hose. Also, when you took off the black hose from the supercharger to the intercooler was it clean inside? If there's white residue in there, then your impeller on the supercharger is probably caked with it too and that can make you lose performance. Definitely have to look in the back of the pump and see if there are any nicks/dents in your impeller also.

    Do you have the oil breather hose hooked up to the riva cold air? If you do, yank that out as you are only re-circulating non-combustible air into the motor. I took mine, added some more hose and ran it to the back area of the ski.

    If you run flat water, take the back seat off and take the bucket out and run the ski and see if it increases in speed, if it does, you need to bring in more fresh air into the engine compartment.

    Once I am done installing and testing my new mods, I won't need my tiny tack. If you want to cover shipping both ways, I'll shoot it over to you so you can see where your rpms are really at.

  6. #6

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    Seeing where I am RPM wise is probably the first thing I need to do. I will get with you on that. Thanks as usual Louis.

  7. #7
    jetpilot785's Avatar
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    Corey, there are so many variables that can affect performance it is very hard to point out any one thing. You can have something in your setup that is not working as well as it should all the way up to the fact there are factory production variances that will affect a products final outcome. Even though the factory tries its best to reproduce a product as identical as it can, each product comes out just a little different from the next. I have 2 2009 FZR's and from working on both of them, I found several differences between the 2 and that is what I can pick out of the crowd. That doesn't include the variences I haven't measured. I have seen the cams had slightly different LSA from each other. I have seen different compression tests on both of them. I have seen small pump variences on both of them. I didn't test boost and rpm as I didn't really care but there could be small variences in how much boost one makes compared to the next, intercooler efficiency and the list goes on and all of those small things can add up.

    To put it in perspective, the bone stock FZR with just the R&D intake grate and ride plate went 69.0 with me on it and the other one went 67.2 with the same equipment and approximtely the same weight with fuel and rider in similar conditions. It also has to do with power to weight because my FZR with cold air intake, ribbon delete, through hull exhaust and modified waterbox barely walked my GF on the bone stocker as she weighs 110lbs and I weigh 195 so she gets hers up to 70 on gps while I was only going 71-72 in a side by side run. That ski is a good one to begin with and now you take away 85lbs which could be the difference between a full tank and near empty for most of us and you have some variables to take into account. My ski depending on what prop/pump setup is in it can pick up or lose 200-300 rpm and 2-3 mph depending on the fuel level alone.

    Even though you don't want to hear it but sometimes that old rumor of "you got a good one" is actually true to a point.

  8. #8

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    JetPilot that is a knowledgable post. Thank you.

  9. #9
    YAMAHA POWAAAA !!!!! 1_Fast_SHO's Avatar
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    I will follow LOUIS advisement. Check intercooler, PUMP, COMPRESSION, also Any minor BOOST leak, SPEED also can vary due to the break in, if the ski was not properly break in, that could be a reason for slow speed, check OIL LEVEL.

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