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  1. #1
    My son (mohawk man) jeffsntx's Avatar
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    Fercho Jetworks installation

    Items needed:
    3 1/8" male npt X 3/8 hose barb 90* fittings
    1 Jetworks valve of your choice
    1 Jetworks gasket
    1 Island racing stealth fitting

    1. Drill 11/32 hole in pump strainer plate to install fitting for Jetworks supply.
    2. Tap hole to 1/8" pipe thread.
    3. Install 90* fitting and reinstall strainer plate.
    4. Run 3/8 hose from fitting in pump strainer plate to OE bilge fitting in the transom plate. Use high pressure hose. DO NOT use the OE siphon bilge hose!!!!
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    Last edited by MikeTrin; 05-04-2007 at 10:38 AM. Reason: by request


  2. #2
    My son (mohawk man) jeffsntx's Avatar
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    5. With OE stinger section removed from ski, drill 11/32 hole in the raised boss just in front of the Temp sensor.
    6. Tap this hole to 10mm X 1.25.
    7. Place temp sensor in this hole
    8. Tap old temp sensor hole to 1/8 NPT.
    9. Place a 90* fitting in this hole. This will be your Jetworks inlet.
    10. BE SURE TO PUT WASHERS ON THE BOLT THAT WILL RUN INTO THE WATER JACKET WHERE THE TEMP SENSOR IS NOW LOCATED. If you dont the bolt will hit and ruin the temp sensor when you put the flange back on the stinger. *SEE PIC*
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  3. #3
    My son (mohawk man) jeffsntx's Avatar
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    11. 90* from the first hole you drilled in the stinger is another raised boss. Drill the hole and tap this hole to 1/8" npt as well.
    12. Install 90*fitting for a drain hose.
    13. Using Jetworks gasket attach flange back to the stinger.
    Last edited by jeffsntx; 05-03-2007 at 09:16 PM.

  4. #4
    My son (mohawk man) jeffsntx's Avatar
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    *pics for step 11 and 12*
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  5. #5
    My son (mohawk man) jeffsntx's Avatar
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    14. Reinstall pipe on ski. It is a good idea to go ahead and attach a piece of 3/8 hose to the fitting on the bottom of the pipe that is the drain hose. It is very hard to get to the clamp once the pipe is on the ski.
    15. Run high pressure hose from the inside of the transom plate where the OE siphon bilge was and route through the stringer plate and connect to the inlet side of the Jetworks valve. Somewhere in this hose you will have to reduce from 1/2" to 3/8" hose.
    16. Connect the outlet side of the jetworks valve to the 90* fitting on the top of the stinger. Be sure to place the valve where it is easy to get to so it may be adjusted easily.
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    Last edited by jeffsntx; 05-04-2007 at 09:42 AM.

  6. #6
    My son (mohawk man) jeffsntx's Avatar
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    17. Cut the drain hose that comes from the top of the stinger to the starboard side of the transom plate in a location of your choice (I cut mine behind the stringer plate)and install the "stealth" fiting.
    18. Route hose from the 90* fitting in the bottom of the stinger that will be used as a drain to the 3/8 nipple on the stealth fitting. It is a good ides to put an inline splicer in this hose around the intermediate shaft so that the stinger can be removed easily without having to remove the battery box, or trying to get to the clamp on the bottom of the stinger.
    19. Tighten all clamps and water test on trailer for any leaks. It is a very good idea to use new high quality clamps on all connections.

    *Sorry I dont have any pics of the stealth fitting install, I am still waiting on it to get here.*
    Last edited by jeffsntx; 05-04-2007 at 09:37 AM.

  7. #7
    My son (mohawk man) jeffsntx's Avatar
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    20. Set Jetworks opening point.

    20a. Take hose off of the outlet side of the Jetworks valve
    20b. Attach a piece of 3/8 hose long enough to go outside of the engine compartment to the outlet side of the valve.
    20c. Run boat with the seat off. While watching the tach, you do not want any water shooting out of the hose until the tach reaches your desired point. I get mine to open between 3300 and 3500 RPM's. If the valve is opening too soon you have to turn the valve clockwise to raise the pressre on the spring. If the valve is opening too late vise versa.
    20d. After opening point is set, re-attach jetworks valve to the inlet on the pipe.

    21. HOLD ON!!!!!!


    I hope I remembered everything. If I think of anything I will edit my posts.

  8. #8
    Hydrotherapy's Avatar
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    very good post

    my pro valve is bottomed out on the thread to work at 3500rpm is this the same on all or was i lucky/unlucky....

  9. #9
    Yellow93's Avatar
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    This is the Cosca method correct? I had heard that is not the best method to use, although it is the easiest... hopefully Island or Fercho will chime in.

  10. #10
    My son (mohawk man) jeffsntx's Avatar
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    This is the Fercho method. I think the cosca method is plumbed into the hose coming from the head to the rear of the pipe.

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