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  1. #1
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    1999 Pro 785 Superstock Build

    So this thread is coming in a little late as I’ve just about completed this build but I figured I would go ahead and give a little story of what’s been going on in my garage over the last several months (and truth be told, the last couple of years…). So sit back, pop open a brew or pour a healthy cocktail of your favorite vodka (mine it Titos), and hopefully you’ll enjoy the story. I'll be adding to it over the next few days..

    For the longest time, I’ve wanted to build an “all out, no holds barred” superstock Pro 785 that would be competitive in the IJSBA or Pro Watercross circuits. I’ve owned and gone through several Pro 785s, my first being my 1998 I bought back in 2008. She has gone through many engine builds but currently seems to be holding together quite well (see latest build thread in my signature). The second was a “grudge racing” 1997 I bought a year or so later that had a Sharps Marine bored and stroked out 785 motor to a whopping 1010 cc monster. Unfortunately, this ski has been decommissioned but I still have all the parts and pieces to maybe one day make it run again. My third was a “pasture princess” I bought in mid-2017 from a fellow racer, which ended up being a pre-production hull that had a ton of goodies. Currently this project is on hold due to the extensive fiberglass and gel coat work I still need to do. My fourth and final (yeah, right!) 785 is this damn near mint 1999 I bought from a racer in Nebraska, which is the backbone of this build.


    To further the background on how I got here, after I bought my pre-production 1997, I spent quite a bit of time and effort to get it running. If you check out my thread on that boat, you can see that it was pretty trashed from sitting around for years outside and uncovered. After a couple of months and a “few” dollars later, I finally got it running and she ran fantastically pulling over 8100 rpm. Unfortunately, the boat suffered from the typical major leaks at the bond line. I decided to split the hull and do some work to get the top and bottom halves looking pristine. Well, as we all know, life gets in the way and the project was taking extremely long to complete. The 2019 race season was fast approaching and there was no way I was going to be able to finish the hull in time. I decided to look around for a nice ’99 or ’00 donor hull for my newly ported engine…and social media came to the rescue. I connected with a racer in Nebraska on Facebook who had a ’99 for sale. The motor in the hull had snagged a ring in the MAG cylinder but I did not care since I would be using a completely different motor. As soon as the boat got to my house, I started to tear into it…a little greasy but overall a very good condition ski that will be a fantastic starting point for my new build.
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  2. #2
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Here is a little teaser of how far this project has come. She ran hard with the stock ignition and I can't wait to run it with the MSD total loss. Just gotta wait for this whole virus thing to pass so I can get on the water!
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  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Cleaned up really well.

    No strainer on the water lines?

  4. #4
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Thanks! Really there is nothing on this boat that is original. Every single part I've gathered.

    No strainer other than the pump nozzle screen. Never had an issue before on any of my skis running just that.


  5. #5
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Here is the parts list:

    Engine / Ignition:
    Dave DeLaughter Ported Crankcase
    Dave DeLaughter ported Cylinders
    Crankworks Crankshaft, Welded
    Wiseco Pro 785 Pistons
    Wiseco Pro 785 Piston Rings
    SBT Connecting Rods
    Wiseco Wrist Pin Bearings
    Wiseco Wrist Pins
    SBT Crankpin Bearings
    WSM Crankshaft Bearings
    OEM Crankshaft Seals
    MSD Total Loss Flywheel
    MSD Total Loss Pickup
    Hot Seat 1 Dot 93 Octane Head - 150 psi
    Domes Modified for Squish 0.0500"
    Piston Clearance Set to 0.0055"

    Fuel / Intake System:
    Riva GP1300R Fuel Pickup
    OEM Dual Fuel Water Separator
    OEM Dual Fuel Inline Filter
    Dual Mikuni Pentagon 65 lph Pumps
    OEM Fuel Selector Valve Deleted
    WPS Primer Pump
    Hot Seat Riflebore 46mm Carburetors
    Hot Seat Riflebore Fuel Rail
    OEM High Entry Jet Blocks with Double Check Valves
    Prok Flame Arrestors
    Outerwear Prefilter
    Moto Marine Ported Intake Manifolds
    Moto Tassinari V-Force 1 Reeds

    Exhaust System:
    Hot Seat Gas Actuated Exhaust Valves
    SeaDoo Red Stainless Steel Springs
    Hot Seat Triple Pipes - Unmodified Stinger
    Watcon Water Routing for Hot Seat Pipes
    Jet Works Adjustable Stinger Flow Valve
    Hot Seat Waterbox

    Hull / Handling / Driveline:
    OEM Top Deck / Hull
    OEM Motor Mounts
    OEM Rigid Coupler
    OEM Driveshaft
    UMI Steering System
    UMI Throttle Lever
    UMI Manual Trim Lever
    ODI Rogue Grips
    Hot Seat Rideplate
    Hot Seat Manual Trim
    Hot Seat Auto Drop Trim
    Hot Seat Sponsons
    Hot Seat 2° Wedge
    Skat Trak 6 Vane Stator
    Skat Trak 11/19 Impeller
    OEM Exit Nozzle

    To be Added:
    Jet Dynamics Intake Grate - #14
    Skat Trak Adjustable Exit Nozzle
    Hot Seat Fixed Trim Tabs
    Skat Trak 8 Vane Stator

  6. #6
    Sage18's Avatar
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    Nice....thanks for the update and parts list!

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Some nice parts there.

    Do you have a 8 vane pump to try out? Really helps bottom end accel over the 6.

    Might want to re-consider a strainer. (hope I didn't lust jinx you) A simple grain of sand or stone can clog those 1/8" orifices in the water manifold. Ask me how i know.

    http://greenhulk.net/forums/showthre...=good+bad+ugly

    After looking through the thread, it does say the pump screen was missing. Not sure where it went because i normally have mine in place.

  8. #8
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Quote Originally Posted by xlint89 View Post
    Some nice parts there.

    Do you have a 8 vane pump to try out? Really helps bottom end accel over the 6.

    Might want to re-consider a strainer. (hope I didn't lust jinx you) A simple grain of sand or stone can clog those 1/8" orifices in the water manifold. Ask me how i know.

    http://greenhulk.net/forums/showthre...=good+bad+ugly

    After looking through the thread, it does say the pump screen was missing. Not sure where it went because i normally have mine in place.
    I do have the 8 vane ready to go along with a titanium stub shaft. I did try it out over last summer and it did seem to load the motor a lot harder but I must admit I had a VERY small exhaust leak at the flange to mid pipe joint that was causing a mid range bog I couldn't for the life of me figure out. I fixed that and it was back to pulling very hard...so maybe it wasn't the stator doing that.

    I plan on tuning the carbs and prop with the 6 vane since I'm not sure how the MSD total loss will behave with the higher load and hotter timing curve. I understand from Randy it is best to pitch the prop down some (I have an 11/18 installed now) and richen up the jets (LS and HS both 5 points higher) with the MSD over the stock timing curve.

    With the 6 vane and 11/19 prop I was pulling 8140 rpm @ 65-66 mph. Pretty damn good if you ask me but I think this MSD is going to be a game changer.

    This is a video of my last run at the end of the summer...


  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    You're ski looks like it's running great. I wouldn't be afraid of trying the 8 vane again though. My only reservation is I'm trying it on the 1200. Even though they make similar HP, maybe the TQ between the 1200 and 785 makes a difference.

    You should be better with the light weight flywheel too.

    Randy knows his stuff (and the Pros) definitely listen to him. Start out fat and lean it down, but you already know that.

  10. #10
    I'D RATHER SWEAT THAN SHIVER hyoctane23's Avatar
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    Randy has been a lot of help for me as well as Ted. I've been very impressed with this ski and with the port work Dave did. I bought this motor from Bob / Lugs and it needed a lot of work. The crank needed rebuilding, cylinders replated and one of the cylinders looked like a backyard hack port job. I believe who ever had this motor before Bob wrecked a cylinder and tried to port it themselves. It was supposed to have been ported by Hot Seat. Regardless, Dave did his magic and got them right.

    I also had some issues with getting the squish correct. As a part of the port work, the cylinders had to be decked to get the overall height the same so I think that threw off the squish. It stated with i think 0.02" squish so Dave machined the domes to get me 0.05" squish.

    I'm running 50/50 VP C12 and 93 pump gas with Klotz R50 oil. No issues at all with detonation.

    For reference, this is what my ski was doing right before I discovered the exhaust leak. Even with the seat off it still did this.


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