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Thread: My GPRXP build

  1. #51
    John's truck's Avatar
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    Well, I couldn’t just leave for a month with no more progress. So I did a DIY intake manifold reinforcement. Just used a bunch of 10-32 SS screws, washers and nylock’s and went to town. Then I cleaned my garage and put everything away. Folks, that’s all until December

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  2. #52
    2000 GPRXP 4tec shooter98xpl's Avatar
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    Nice build, like how the rxpx handle bars look on this setup.
    I tried the 3 degree nozzle on mine and it was like dragging a weight behind the ski. You probably want the 5 degree nozzle. And a brake hone is your friend when opening up the nozzle size.
    Also, on the trim tabs, 0.15 to 0.185 is a good starting point and probably almost get you to where it needs to be. Just depends on rideplate angle.
    Great build so far man. Now I am going to order some Rivnuts, hahaha.

  3. #53
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    Quote Originally Posted by shooter98xpl View Post
    Nice build, like how the rxpx handle bars look on this setup.
    I tried the 3 degree nozzle on mine and it was like dragging a weight behind the ski. You probably want the 5 degree nozzle. And a brake hone is your friend when opening up the nozzle size.
    Also, on the trim tabs, 0.15 to 0.185 is a good starting point and probably almost get you to where it needs to be. Just depends on rideplate angle.
    Great build so far man. Now I am going to order some Rivnuts, hahaha.
    So the 3 degree and 5 degree nozzles I have are both 87mm. I didn’t think I’d really need to open them up any... might be easier to repitch the prop if im not getting my target rpm. I’ll keep that tip in mind though

    Oh yeah the Riv nuts are money! I can’t even describe how long I stared at some components trying to dream up a bracket for it, then realized I could just bolt it directly to the hull without any fabrication. I’m sure they’ll get used again for something in this build

  4. #54
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    Well the month long work/fishing trip is over and I’m home. I caught the best fish of my life (45 pound wahoo), and I forgot where I left off on this project. I’m staring at the hull trying to figure out where I was with bilge pump wiring and closed loop hoses. And then I need to finish up the engine and get this ski in the water before it warms up again!

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  5. #55
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    OK, enough fish. Back to jet skis. I got off my ass and got down to my buddyís shop today. Lapped all the valves (Supertech), installed new seals (WSM), Iím reusing my stock X springs and got a set of Chinesium-titanium retainers. After all that, slid in my -629 cam and was done for the day. I have to take my rocker shaft somewhere to drill out the oil supply hole from 2mm to 3.5mm (9/64) with a carbide drill bit that I donít have. Hopefully Iíll get that done tomorrow after work and finish the head.

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  6. #56
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    Well I managed to drill the oil passage out to 9/64. What a pain. But, Iíll have better oil pressure for higher RPMís if I decide to turn up the power. Just gotta clean up all this metal dust that got everywhere

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  7. #57
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    More progress today, the head is finished. I cleaned up the rocker shaft, had to clean up a little bit of marring between the rocker arms (where the intake and exhaust make contact) and bolted everything up. I just mocked up the exhaust spacer for giggles.
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  8. #58
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    Well I started tearing in to the bottom end of the engine today. This one is a 2006. Iím going to do rings, bearings, and some ARP goodies, but itís staying stock. So, being a 2006 it has the god-forsaken mild steel hex bolts throughout the whole engine. Luckily, I already completely tore down my 2008 hydro-locked engine so I have all the new style stainless E-Torx hardware. Itís just that removing the old crap is the issue. Well, there were bolts that had shrunk from to 10mm to 9mm, some down to 8mm, and some of those were missing half their head. So they got the chisel and vise grips. Unfortunately, I broke the ear off the bottom of the PTO housing. And the 2008 housing has a crack due to the engine going sideways and snapping off the driveshaft. So Iím on the hunt for a 2008 PTO housing or an older non-X I can swap my oil squirter in to. Hopefully I can make some more progress in the hull this weekend and then get back to the engine stuff on Monday

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  9. #59
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    Well, the ARP head studs I’ve had in order since September are no longer arriving in December… now they’re telling me MARCH 2022. So, this engine is going to get built with stock SeaDoo head bolts and then swap them out later when the studs show up. Which is fine I guess, I plan on keeping the stock X charger and stock tune/RPM for a while. It’s just aggravating

  10. #60
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    Finished engine disassembly today. Tomorrow Iíll clean up the outside and hopefully get started on rings and bearings and putting it all back together. Iím still salty about the ARPís getting delayed but it will be fine running stock head studs at stock horsepower levels. Iím not crying. Youíre crying

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