1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)
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  1. #1
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    1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    Here is the deal with this thing: I sent the PRO785 crankshaft to Crankworks in Arizona along with a 780 crank for spare parts. I sent brand new SBT rods, OEM bearings, and new crankpins with it. I got it back and assembled the entire engine. I tested the compression and it was not right. I checked the stroke and it was wrong. I had to take the engine out and send the crank back to Crankworks because they had rebuilt the wrong crank and they threw out my 785 crank. They agreed to re-stroke the crank for free and they sent it back to me. I again assembled the engine and the compression was better. But still not high enough considering I had the head milled down by Group K. I called crankworks again and they said they never measured the rod length because the tech had thrown out my original 785 rods and they had nothing to compare to. Now the engine is assembled and in the ski again and it starts and runs but bogs at low rpm and loads up with fuel. That is because the rod length is incorrect and the pistons pass the ports at the wrong time. What this thing needs is a set of OEM PRO785 rods. The flywheel key is also clocked about 30 degrees out of place due to them using the wrong end but I was able to move the stator and re-drill the mounting holes in the stator plate which allowed me to set the timing perfectly. I am OUT OF TIME and patience to take this apart and do the rods. I have spent THOUSANDS and will take a disgusting loss on a ski that could be worth a lot if I could finish it. My loss is YOUR GAIN.

    Here are the rest of the details about what I have done to this ski:
    Freshly rebuilt motor, crankworks c20160131_150059.jpgIMG_20141220_203637_266.jpgIMG_20150104_132204_490.jpgrank, Group K head with wide squish bands, new wiseco pistons, brand new re-plated
    stock bore cylinders, port and polish on cylinders and exhaust manifolds with matched gaskets, rebuilt carbs, watcon
    lightened and balanced flywheel, watcom cooling mods with special diameter hoses and billet flow control valve, brand new
    starter, top loader, intake grate, new solas X prop, new hull seal and shaft coupler on engine, 4" bar risers, billet throttle,
    protaper bars, good hull, no leaks, no fiberglass repairs, no deep scratches, cracks, or damage. Clean title in my name. Does not
    include trailer.
    Located in St Petersburg FL 33713. Text 248-878-6386

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    Such a shame. I hate to hear about stuff like this happening. If somebody is not completely sure of what's going on,.....is it really that hard to make a simple phone call? It's just easier to get things right the first time. Then you could have assembled this thing and been riding it already.
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    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  3. #3
    PWCToday.com Is My Home Away From Home bandit88's Avatar
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    Tell crankworks to order some OEM rods, they are still available. As well as the correct end for the flywheel.
    -95 750SXI
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  4. #4
    Resident Guru 785 lugs's Avatar
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    oem rods are long gone but they could replace your sbt rods that's BS or use snowmobile rods from Hot rods but you have to grind down the big end because they hit the cases

  5. #5
    PWCToday.com Is My Home Away From Home bandit88's Avatar
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    it looks like they are still available? https://www.bikebandit.com/oem-parts...443&sch=490797
    -95 750SXI
    -86 440 with PJS800 conversion (now 650) - http://www.pwctoday.com/showthread.php?t=466927
    -92 750SS
    -81 JS440
    Parts for sale HERE

  6. #6
    PWCToday Guru Dan87951's Avatar
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    That sucks! These guys screwed up and won't make it right?
    04' Shorelander Double Trailer
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    My Jet Ski videos below.
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  7. #7
    PWCToday Regular ultra560's Avatar
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    how clean is the hull? got any pictures?

  8. #8
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    Where are the OEM rods available? I was under the impression that they are nearly impossible to find. I really need to do something with this ski. It's a shame to have it sitting around still.

  9. #9
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    Re: 1998 Polaris PRO785 PROJECT DIRT CHEAP - $999 (St Petersburg,FL)

    The hull is perfect. I'm posting more pictures finally.

  10. #10

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