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  1. #1

    08 gpr advice needed.

    I am new to the ski scene but not to fast toys. I bought an 08 gpr a few months ago. I have a few issues that I can't pin down and need some help with. First off it hesitates when going from a cruising speed to wot. It isn't a huge issue just a little annoying. I tried some sea foam in the fuel hoping it was just the injectors sitting for a few months.

    After the seafoam the ski started throwing an exhaust sensor code. 52 I think. This only happens under cruising conditions and is amplified with another rider. Wot or hard running no problems.

    My biggest issue though is the hole shot. The ski bounces of the limiter and feels sluggish till its on plane. It feels like the ski has no traction. Is this normal? The previous owner said it needed a wear ring. The gap between the impeller and ring was kind of big. I replaced the ring with a Riva stainless unit. The ski feels much better all around but out of the hole it still feels like its just spinning the impeller.

    Mods as far as I know are, high flow air filter, d plate, cut waterbox, free flow exhaust, intake grate, ride plate, pump shoe seal kit, milled heads and a skat track 13-19 setback impeller.

    Any good info is appreciated!!


  2. #2
    Happily Self-Employed WFO's Avatar
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    Your impeller probably has cavitation pits. Inspect it for burn marks, usually in the middle of the blades.

    What kind of controller and what are the settings?

    and what is this "cut waterbox"?

  3. #3
    The impeller is almost brand new. I did not see any damage except for a slight dulling on the leading edge. I don't have a fuel controller. I can understand the need for one I just have not got to it yet. I'm not sure exactly on the box. I think the guy before me cut it openand gutted it. I don't have much info from the previous owner. The controller wouldn't have anything to do with cavitation would it? I was thinking that a 13-19 might just be the wrong pitch for the power the ski is making. I could be wrong though.

  4. #4
    Happily Self-Employed WFO's Avatar
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    You really need to get a controller on there before you melt a piston, but no that wont cause the cavitation.

    Cavitation can be caused from a worn impeller/wear ring or it may be sucking in air from somewhere like pump shoe, wear ring to pump seal or even a cracked tunnel. Is there always water in the boat?

    Also what kind of intake grate? If its an 800 grate, it will always cavitate. Post some pics

  5. #5
    powerstroke specialist mikegp's Avatar
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    it looks to me like the impeller is too small anyways. with the increase compression I will think he will need at list 14/20 and go up from there.

  6. #6
    I figured cavitation would be in the pump. When I did the wear ring i made sure everything was sealed up that I had apart. I usually don't have much if any water in the hull that I know of. I will dry it out real good and tale it for a good ride and check again for sure. I'm not sure what grate is on it or what manufacture it is. I guess I need to get in touch with the guy and try to get some more spacifics. Wfo are you thinking that its running lean and that's y the code is coming on? Do you guys tune off of egt or afr? I've never been around two strokes mi h. Thank you guys for the input!!

  7. #7
    Quote Originally Posted by WFO View Post
    You really need to get a controller on there before you melt a piston, but no that wont cause the cavitation.

    Cavitation can be caused from a worn impeller/wear ring or it may be sucking in air from somewhere like pump shoe, wear ring to pump seal or even a cracked tunnel. Is there always water in the boat?

    Also what kind of intake grate? If its an 800 grate, it will always cavitate. Post some pics
    ++++1

    The gutted air box and free flow creates a lean condition due to insufficient scavenging at certain RPM's. That would explain the exhaust code because you don't have a fuel controlling adding back the necessary fuel to the circuit. As WFO mentioned, it's pretty imperative you either get one or put the oem waterbox and rear resonator's back on... .

  8. #8
    Happily Self-Employed WFO's Avatar
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    Take a picture of the grate and post it here.

    Im sure its running lean by the mods you posted. Is the sensor and wiring still in the top of the stinger?

    Unfortunately we dont have any precise way to check afr on these. We usually tune by tach and plug readings.

  9. #9
    OzarkYamMonster's Avatar
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    Hello surfmavrik, 1st things 1st, the 08 1300 is a pig out of the hole. You have however stated that there are some mods done. The normal mods for speed & increased hole shot are to install d-plate, stuff pump shoe, install a top-load intake grate, and an after market ride plate. the 13/19 impeller should actually help with the slow or sluggish hole shot issue. But with the mods you state you should not have cavitation concerns. The 13/19 prop is most likely not your problem. Now the issue of free-flow exhaust & water box changes .... that can rob you of power. Trust me Rich @ WFO, knows all there is to know when it comes to these Yamaha GPR ... yes you need to get a fuel controller ... and a tachometer. The fuel controller will allow you to set & tune the correct fuel amount to the injection system and the tach is needed so as to tune your controller settings to get the most RPMs and fine the power band you will best [email protected] There are several of us GP1300 owners on here and we have all been there & done that when it comes to getting the most these skis have to offer. By the way it is a tinker's joy to work on the GPR ... they can do so much and have so much to give. Trust what Rich says he is the go-to guy. Good Luck P.S. he can also get you some good prices on the tach & controller and save you a lot of $$

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  11. #10
    CJ's gpr's Avatar
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    Listen to Rich (WFO). he knows anything and everything about this ski. i would say forget about the acceleration for now and get a controller asap.

    the 13/19 should actually help acceleration. pull your pump shoe, check out that and see which intake grate you have.

    http://www.greenhulk.net/forums/show...59#post2278159 heres a list of some warning codes, not sure of 52

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