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  1. Thread: Gpr resurrection

    by Adam
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    219

    If you have a GP1200 /1300 up 2004 you will have...

    If you have a GP1200 /1300 up 2004 you will have the 60mm hub 155mm dia pumps . Those pumps dont have the higher thrust levels available from the 75mm hub high pressure pumps . The Skat trak set back...
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    137

    There are plenty of hulls around with no engines...

    There are plenty of hulls around with no engines , but you could fix it at a pinch .
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    Who made R&D ride plates & Scoop grates ?

    Did R&D have their own metal casting equipment or did they get an outside contractor to make them ? I believe thereís still demand for these parts that isnít being met .
  4. Thread: Gpr resurrection

    by Adam
    Replies
    6
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    219

    Yes it’s a modified stocker , it’s good in rough...

    Yes it’s a modified stocker , it’s good in rough water .
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    422

    You need to check your carb throttle joining rod...

    You need to check your carb throttle joining rod , sometimes they break or pop off so only 2 cylinders are getting throttle openings .
  6. Thread: Gpr resurrection

    by Adam
    Replies
    6
    Views
    219

    Gpr resurrection

    Saved this 07 GPR hull from destruction, now with a 1200 PV engine with 38cc head , 07 exhaust system, 1200 water box , R&D 1200 grate , R&D trim tabs , 14 vane Skat trak 158mm setback pump ,85mm...
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    View Post

    I love my GP1200r/ 1300r skis I have 3 of them and an XLT 1200 . I am seeing a lot of skis being blown up from negligence and parted out , how many did Yamaha make world wide ? I see wreckers in...
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    305

    The GP1300R has the 75mm hub too ,what size...

    The GP1300R has the 75mm hub too ,what size bearings does it use ? You will need a 1300 impeller with a 75mm hub if you use the 20mm driveshaft with the 8 vane stator.
  9. As Mudslanger said , its a money pit for the...

    As Mudslanger said , its a money pit for the inexperienced . Parts are getting hard to find , R&D made the best intake grates and Rideplates for the GPR and they retired from the business making R&D...
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    The problem with oil injection is the carbs never...

    The problem with oil injection is the carbs never get a protective coating of oil that stops corrosion in the carbs if you leave the ski sit for winter .
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    1,372

    Make sure you flush out the middle crankcase with...

    Make sure you flush out the middle crankcase with solvent and rag then blow it out with compressed air ,have good look for any damage. It’s been my experience you can get luck and have not crank...
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    Have you checked the deck height of all three...

    Have you checked the deck height of all three cylinders ? When you say "you get water in 1& 2 cylinders " how much ? And how is it manifesting ?
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    422

    Sounds like one cylinder has lost compression.

    Sounds like one cylinder has lost compression.
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    443

    Have you machined the head ?

    Have you machined the head ?
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    443

    I have a 14 vane 158mm setback Skat trak pump and...

    I have a 14 vane 158mm setback Skat trak pump and an 07 75mm hub high pressure oem pumps.
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    443

    I have both parts too ,I just measured them both...

    I have both parts too ,I just measured them both and I was incorrect! The 05 pipe is different in both the joint pipe and the stinger diameter on item 25 ! The early pipes were 69.54mm dia and the 05...
  17. Aftermarket 1200 grate ,the 800 grate is faster...

    Aftermarket 1200 grate ,the 800 grate is faster and is curved on the rear scoop edge.
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    156

    Do you have any photos of the plate and grate it...

    Do you have any photos of the plate and grate it has currently ?
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    443

    Item 25 wasn’t changed ,it’s item 16 that was...

    Item 25 wasn’t changed ,it’s item 16 that was updated in 2005 from the 03/04 models . The 1200 pipes are the same as the 03/04 pipes . Hope this helps , the photos I posted are the “joint pipe “ item...
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    View Post

    Yes mate , I have done it on two GP1200Rís . Adds 10 hp to the power .
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    141

    Most desirable GPR/ XLX ?

    Which. Yamaha is the most sought after in the second hand market? A GPR or an XLX ? Trying to decide which ski to restore and keep / sell .
    Thanks for your input.
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    Cranks are the same ,so are the seals . Just put...

    Cranks are the same ,so are the seals . Just put a 1200 crank in a 1300 . The 1300 cylinders have an exhaust port height that is 2mm lower than a 1200 cylinder. It’s a fixed height and the rev limit...
  23. Have you looked at the plastic nut that holds the...

    Have you looked at the plastic nut that holds the steering cable in place where it goes out the back of the hull ? If it is broken you may have slop and uncommanded movements in the steering.
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    642

    This is a ported 1200 cylinder by Judge ,note the...

    This is a ported 1200 cylinder by Judge ,note the finish is rough . What is the exhaust port height on the 1300 power valve cylinder by the way ? I know the 05-08 cylinders are 42mm down from the...
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    642

    The 1300 anodes are in the head ! Looks like the...

    The 1300 anodes are in the head ! Looks like the skirts have been cut shorter than the middle one .
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