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  1. Re: Yamaha's 2-stroke power-valve problem: please read and post opinions/experiences

    This is an old post but I thought I would comment on this. First, your failure (if I understand it correctly) is the stem of the PV breaking where cross hole for the pin is drilled which is neither...
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    445

    99 gp800 intake grate question

    I bought my wife a 99 gp800x last year and I think it could benefit from some better flow through the pump. I installed a reman impeller from sbt because the original one was pretty banged up. I...
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    24
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    4,623

    Re: 95 Superjet backfiring

    Check the stator.
  4. Replies
    3
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    930

    Re: 1999 gp 800r

    Check ur power valves, its acting the same as mine when it had a broken power valve. If it is broken, don't run it or it can cause major engine dmg. If u have more questions about baoken pvs, pm me.
  5. Replies
    16
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    14,064

    Re: gp 800 top speed and rev question

    I just double zip tied my oil lines and check them often. What did you do mike, get the oil pump delete kit?
  6. Replies
    16
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    14,064

    Re: gp 800 top speed and rev question

    I have a 99 gp800 and it should be 7100-7200 rpms with a good stock impeller. When mine wouldnt go above 6500-6600 rpms I had a broken power valve. That is the first place I would check. Take out...
  7. Replies
    19
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    1,387

    Re: Used yamaha ski hours??

    One more time, the waveeater clips and power valve coupler is key. I had a friend with a '03 gp800r (same motor) that his power valve broke with only 60 hrs on it. The dealer said that the...
  8. Replies
    8
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    982

    Re: Super Jet Square nose frozen engine?

    Sounds to me like it could be a bendix issue. As said b4, check the solenoid, I would also check all elec connections for corrosion. Pull starter and hook it up outside the hull, if it spins check...
  9. Replies
    19
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    1,387

    Re: Used yamaha ski hours??

    I bought a 99 gp800, 160 hrs with trailer for 2000. Everything looked brand new. Turns out it had been sitting for a few years and the crank had rusted. When the bearings failed it took out a...
  10. Re: 2004 sj won't run with switch on full!

    Make sure the fuel pick up line is not suctioning to the bottom of the fuel tank. Cut a v-shape at the end of the line. Stock is a straight angle cut.
  11. Replies
    3
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    908

    Re: GP 8 vs Gp 12

    I have a 99 GP800 so I can only chime in on that. It is rated at 120hp and weighs 500lb dry. Mine does about 60 and gets there reasonably fast but I have only owned it for a short time. In my...
  12. Re: Yamaha's 2-stroke power-valve problem: please read and post opinions/experiences

    Well, I haven't talked to anyone who has used the SBT lever link, but it seems like a sound design. I have heard, but haven't verified, that SBT installs the updated lever links on all of the engines...
  13. Re: Yamaha's 2-stroke power-valve problem: please read and post opinions/experiences

    The pin keepers you are referring to are called waveater clips. SBT has a solution for this too, redesigned pv lever links seen here: http://www.shopsbt.com/yam-1999-gp800/46-406-14.html As for the...
  14. Yamaha's 2-stroke power-valve problem: please read and post opinions/experiences

    If you own a 2-stroke Yamaha PWC with exhaust power-valves and you have done any research at all, there are known issues with the exhaust valves. There is even a couple different after-market fixes...
  15. Replies
    7
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    2,529

    Re: Please help with GP800, motor blown

    So I split the case and pulled the crank out and could see rust spots on the crank web of the bearing that went bad, this firmly points towards improper winterization at the end of a season. I am now...
  16. Replies
    7
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    2,529

    Re: Please help with GP800, motor blown

    Which what do I spin the coupler to remove it from the crank?
  17. Replies
    7
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    2,529

    Re: Please help with GP800, motor blown

    I got the motor out and the rod crank bearing failed and sent shrapnel into the top end. SBT only resleeves the cylinders, I would like to replate. Has anyone ever used atlanticjetsports for crank...
  18. Replies
    7
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    2,529

    Re: Please help with GP800, motor blown

    The power valves are fine. That is the first thing I looked at and there is no sign of wear on the valves and the valves still move up and down when I turn the shaft. I checked and they clear both of...
  19. Replies
    7
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    2,529

    Please help with GP800, motor blown

    So we just bought a 1999 GP800X with 185 hours on it. Impeller was shot so replaced that with sbt remanufactured. Took it out the second time and the ski was great, pulled hard rode nice, no...
  20. Replies
    4
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    619

    Re: 1999 gp800x pump questions

    So I pulled off the intake grate and the leading and trailing edges of the impeller are pretty rough. There are a couple good sized rock divots too. The clearance between the wear ring and the...
  21. Replies
    4
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    619

    Re: 1999 gp800x pump questions

    Thanks gaviski for the links they are helpful. I have yet to pull the pump out but I am looking at options assuming I need a wear ring, impeller or both. I have found that sbt and impros do impeller...
  22. Replies
    4
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    619

    1999 gp800x pump questions

    I just bought a 99 gp800x with 185 hours on it. Took it out for the first time today and it runs great, but it caviatates very bad, max speed is about 35 mph. I know that it is most likely an issue...
  23. Replies
    2
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    846

    Re: Hydroturf questions

    Thanks for the info.
  24. Replies
    2
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    846

    Hydroturf questions

    I have a squarenose sj and I am looking into redoing the turf on it. I am currently in the planning stage and looking for some guidance on the proper way to returf a ski. I want to redo the whole...
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    759

    Re: Stock carb set up on sj 650

    Fox has a lot of great info, he is a great poster and had answered PM'd questions before for me. Thanks.
  26. Replies
    2
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    759

    Stock carb set up on sj 650

    I have a bone stock sj 650, anyone know what the carb settings should be at? The previous owner said he 'leaned it out a bit' and I want to set it to stock. Even better: does anyone know how to set...
  27. Replies
    3
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    2,780

    Re: Bore 650 superjet to 701 pistons?

    thnx for the info. I may just buy a whole 701 motor and convert
  28. Replies
    2
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    587

    Protec Mach II pipe on a sj 650?

    Anyone put a Protec Mach II pipe on a superjet 650 motor? Any issues? Recommendations?
  29. Replies
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    6,259

    Re: Aftermarket pipe

    I am from Fargo.
  30. Replies
    4
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    6,259

    Re: Aftermarket pipe

    Good to see the ND forums are active. I guess I should have specified that I am looking for a manifold, elbow pipe and expansion chaimber.
  31. Replies
    4
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    6,259

    Aftermarket pipe

    Nice to see that there are some other riders from ND. I have a '91 sj and I am looking for a used aftermarket exhaust system. Does anyone know someone that is fairly close to the area that may have...
  32. Replies
    3
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    2,780

    Bore 650 superjet to 701 pistons?

    So my stock 650 motor is lacking the power I want. I have heard that you can bore it out and put 701 pistons in it. I did the calcs and from what I can tell it needs to be bored 2mm or about .080...
  33. Replies
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    1,481

    Re: 701 cdi in a 650?

    For those of you who have updated to a 701 cdi, was there a significant performance gain?
  34. Replies
    5
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    1,481

    701 cdi in a 650?

    Anyone heard of just dropping a 701 cdi box into a 650 to get the higher rpm? Do you just need the cdi box alone?
  35. Replies
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    746

    Squarenose intake grate

    I have a '91 squarenose that has a completely stock engine, a stainless impeller and a weak, non-scoop aftermarket intake grate. I am having issues with porpoising and cavitation. From what I hear a...
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