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  1. #1

    Unique project hoping to borrow you guys experience along the way

    Im nearing the end of a jet jon build and this morning I begin hooking up controls, mounting exhaust, figuring out carb line routing, building a fuel cell etc...

    Forgot to get the donor ski year and model before I cut the hull and scrapped it but my model # is WC70DCSP-02 if that is enough to know what ski it came from to make looking for mods and parts easier?

    I have a clearance issue with the exhaust being to long but I have a possible work around unless you guys tell me it wont work for some reason, pic will be below of problem and possible fix (it involves mounting exhaust to transom and buying a piece of radiator 90* hose at junk yard).

    I bought two Polaris skis on a double trailer and have dropped the trailer for shallow water launching and extended it to fit the 18' river jet boat, the extra ski is said to need rings and is a SL 650, 3 cylinder, Im curious is this motor can be turned into something with 100+ HP with some mods and parts swapping? Will the jet pump fit the 700cc if I end up scrapping the 650? Any other parts I should save as spares?

    I thank you all in advance for any help you can offer, Im working on this now and will check for replies often through out the day. I will work on boat stuff till you guys offer exhaust info.

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  2. #2
    Here is the exhaust where it should be and also where I have room for it. Will this create issues? Loss of HP?

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  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Are you going to re-use the ride plate from the PWC?

  4. #4
    Also can I do away with the gas tank plastic tube thing and just route lines into top of homemade tank? Im capping of the oil injection also this morning, air tight plate is what I read I need to do along with rubber vacuum plug the lines into the carbs.
    Last edited by Jet_Jon; 04-28-2015 at 09:11 AM. Reason: illiteracy

  5. #5
    Quote Originally Posted by K447 View Post
    Are you going to re-use the ride plate from the PWC?
    Yes. I have it ready to install, I will need to weld on some mounting brackets since I had to cut away the factory ones. BUT I can custom fab anything you guys tell me that will increase HP or performance.

  6. #6
    Also here is the Insurance totaled jon boat before and after, the bow was crushed so I copied a war eagle and rebuilt it. It was a riveted jon and I turned it into an ALweld also to help make up for the HP increase. I hate the flimsy shaky rivet boats, they feel like at any moment they are going to fly apart.

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  7. #7

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    you can mount the waterbox any where you want it doesn't matter

  8. #8
    Quote Originally Posted by 785 lugs View Post
    you can mount the waterbox any where you want it doesn't matter
    Its a water box and not a common muffler? Can I shorten it 5 1/2" and not lose any performance?

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Jet_Jon View Post
    Quote Originally Posted by 785 lugs View Post
    you can mount the waterbox anywhere you want it doesn't matter
    Its a water box and not a common muffler? Can I shorten it 5 1/2" and not lose any performance?
    Waterbox does act like a muffler, but it uses the internal baffles AND the presence of water inside to quiet the exhaust noise.

    There is water spray injected into the exhaust flow via the small hose, mesh filter and calibrated orifice on top of the exhaust pipe. That is the small hose looped on top of the big exhaust pipe. Make sure those are clean and clear. Do not increase the orifice hole size without understanding how it affects performance.

    You can cut up and change the waterbox size, but it will alter the noise. It works differently from a car muffler because the water turbulence inside is a big part of how it works.

  10. #10

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    Quote Originally Posted by Jet_Jon View Post
    Im nearing the end of a jet jon build and this morning I begin hooking up controls, mounting exhaust, figuring out carb line routing, building a fuel cell etc...

    Forgot to get the donor ski year and model before I cut the hull and scrapped it but my model # is WC70DCSP-02 if that is enough to know what ski it came from to make looking for mods and parts easier?

    I have a clearance issue with the exhaust being to long but I have a possible work around unless you guys tell me it wont work for some reason, pic will be below of problem and possible fix (it involves mounting exhaust to transom and buying a piece of radiator 90* hose at junk yard).

    I bought two Polaris skis on a double trailer and have dropped the trailer for shallow water launching and extended it to fit the 18' river jet boat, the extra ski is said to need rings and is a SL 650, 3 cylinder, Im curious is this motor can be turned into something with 100+ HP with some mods and parts swapping? Will the jet pump fit the 700cc if I end up scrapping the 650? Any other parts I should save as spares?

    I thank you all in advance for any help you can offer, Im working on this now and will check for replies often through out the day. I will work on boat stuff till you guys offer exhaust info.

    Click image for larger version. 

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    Is that trim motor going to sit outside the hull, potentially submerged? I don't think it's going to last very long that way. I don't think they are waterproof, but water-resistant.

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