98 SeaDoo XPL Resto-Mod - Page 22
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  1. #211
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    Re: 98 SeaDoo XPL Resto-Mod

    Looks nice. How are you running your lines to the motor. I have a similar set up, I was going to supply the head with cool water. And cool to the exhaust manifold. Then out through the lower drain maybe out through a restricted upper inlet. Have to figured it out yet.

  2. #212
    PWCToday.com Is My Home Away From Home fastgas's Avatar
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    Re: 98 SeaDoo XPL Resto-Mod

    Quote Originally Posted by Hydro-Mike View Post
    Looks nice. How are you running your lines to the motor. I have a similar set up, I was going to supply the head with cool water. And cool to the exhaust manifold. Then out through the lower drain maybe out through a restricted upper inlet. Have to figured it out yet.
    The input from the pump goes straight to a factory pipe strainer (the water box pisser has been deleted, 1 output from the strainer feeds the stinger, 1 output supplies the ECWI solenoid), from there it T's, one side goes to the head, one side goes to the chamber. The chamber side supply has a 5/16" T which feeds the case cooler. The case cooler has a 3/8 outlet to the a thru hull. The mismatch is intentional to maximize the time the water is in contact with the cases while still preserving input pressure for the chamber. The pisser on the bottom of the manifold connects to its own thru hull. The pisser at the top of the pipe goes to its own thru hull. The output from the manifold and top of the pipe Y to the stock output which exits at the transom. The head air bleeders have been enabled and Y'd together and connect to their own thru hull after passing through a mikuni main jet that has been drilled out.
    The carbs are running twin, integrated fuel pumps fed by a single pulse (this may not be sufficient and I might have to re-purpose the rave vacuum line and drill the raves) line. The return line Y'd together with a jet in the Y to increase fuel pressure in the rails.

  3. #213
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    Re: 98 SeaDoo XPL Resto-Mod

    Nice, thanks.

  4. #214
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    Re: 98 SeaDoo XPL Resto-Mod

    Updates?

  5. #215
    PWCToday.com Is My Home Away From Home fastgas's Avatar
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    Re: 98 SeaDoo XPL Resto-Mod

    There probably won't be any further updates. I purchased a nearly complete RV8 kit and will be working on that from here on out in my free time.

  6. #216
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    Re: 98 SeaDoo XPL Resto-Mod

    Here's an update. I sold this back in April to a friend who promptly finished assembling it and burned the PTO on the first ride. He had a 200 jet in the stinger and about 220 total jetting. He also shorted out the racepak and didn't bother to find a way to monitor EGTs. So I bought it back in mid July, rebuilt it, and I'm now just finishing reassembly. I replaced the racepak with a Koso tach/egt/water temp unit, dropped the stinger jet to a 160 (I'm guessing it will need to go down even further), and gave it 265 total jetting to get started.


  7. #217
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    Re: 98 SeaDoo XPL Resto-Mod

    Dang. Should left the 97.5 pipe and carbs for that stone cold reliability I guess haha. Beautiful engine though.


    Sent from my iPhone using Tapatalk

  8. #218
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    Re: 98 SeaDoo XPL Resto-Mod

    So after tinkering with this for a few minutes in situ, I've discovered there's something wrong with the fuel pump system. The carbs each have their own pump and the pulse line feeds were T'd together by the previous owner. I'm wondering if one pulse line split and feeding two pumps does not provide enough pressure to move fuel. Also, oddly enough, when the pulse line is removed after cranking for several seconds fuel spits out of the fuel line leading to the tank. I'm curious if this means the check valves are installed backwards. I went through the carbs prior to installing them and they were clean. I can block off the check valve outlet on the hull and successfully pressurize the fuel tank via the return line. I also completely bypassed the fuel selector thinking this may be a fault.

  9. #219
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: 98 SeaDoo XPL Resto-Mod

    I have run two pumps from one pulse fittings many times on carbs like that but not on 951's. I always try to use 90's and pieces of hose with curves molded into them to try and keep the pulse line hose as short as possible.

  10. #220
    PWCToday.com Is My Home Away From Home fastgas's Avatar
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    Re: 98 SeaDoo XPL Resto-Mod

    well there's the problem

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