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  1. Replies
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    Those cylinders are Nikasil coated. There are a...

    Those cylinders are Nikasil coated. There are a few vendors that can replate, but my understanding is they need to do all four. Millennium Technologiesis one of them. Or you can source another set of...
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    Slightly off topic, but an easy way to fill the...

    Slightly off topic, but an easy way to fill the carbs after a rebuild is to pull the return line, then apply a little air pressure to the return hose until fuel starts dribbling out the return...
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    Just attach your drill chuck to this like it was...

    Just attach your drill chuck to this like it was a drill bit.

    -Greg
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    I just pull the pump and attach directly to the...

    I just pull the pump and attach directly to the drill chuck. In my experience it has to spin pretty fast, but I'm more just looking for verification oil is pumping out of all the lines.

    -Greg
  5. The cams may appear to be moving the valves, but...

    The cams may appear to be moving the valves, but that does not mean you do not have stuck valves, which are very common in this motor if it sat up for a long time with a full water box. A little rust...
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    Thanks for the reply. Yes, (3) new 1.5...

    Thanks for the reply. Yes, (3) new 1.5 needle/seats. Running injection. The oil lines seemed pretty good, and I did test by pulling the injection pump and putting a drill on it. Nice even flow from...
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    Thanks for the reply. Are you saying I should...

    Thanks for the reply. Are you saying I should richen-up the lows? Maybe another half turn?

    -Greg
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    Here are pics of the plugs. This is not full...

    Here are pics of the plugs. This is not full throttle/chop/pull plugs, but after I ran onto the trailer and shut off. For what it's worth.

    -Greg
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    GPR/XLT 1200 Carb Recipe

    I picked up a 2000 XL1200LTD with another FX140 deal a couple of weeks ago for a very good price. Super clean ski, 66 hours, perfect compression, freshwater it's entire life, garage kept. Owner said...
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    Replying to my own older thread to update for...

    Replying to my own older thread to update for completeness...

    Yes, for the FX140 version of the MR1 you will need to cut the rear-most hump. I'm told by a friend that the 1.8 requires both humps...
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    On the SUVs the ride plate bolts, pump shoe...

    On the SUVs the ride plate bolts, pump shoe bolts, and motor mount bolts are threaded into a thick piece of aluminium that is sandwiched in fiberglass. You should be able to tap it for a slightly...
  12. On dry ground, tilt the ski up as high as you can...

    On dry ground, tilt the ski up as high as you can on the trailer. Fill the back end with water over the top of the mid-shaft housing. Look for leaks under the ski.

    -Greg
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    FS 2" pump spacer and five (5) 95mm bolts available?...

    2" pump spacer and five (5) 95mm bolts available?

    -Greg
  14. Thread: fx140 2002

    by boudin
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    Why not an XLT1200 hull? Lots of them out there,...

    Why not an XLT1200 hull? Lots of them out there, similar hull to the FX140, and same 66V motor.

    You might also post your location, or add it to your profile.

    -Greg
  15. Just saw this pop up and figured I'd weigh-in on...

    Just saw this pop up and figured I'd weigh-in on VX fuel economy. In our Yamaha SUV MR1 conversions, with the 1052cc MR1 (VX motor), an 18.5 gal FX fuel tank, we see a little over 100 miles at...
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    After struggling with this same problem for...

    After struggling with this same problem for years, I now reverse-assemble the 12F/15F motors. Start with the cylinders and top case half only, and drop-in each piston from the top (rod attached)...
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    FS 1999 66V Complete Motor & Electronics

    This is a 1999 66V Powervalve motor that came out of a freshwater ski. Very clean. Has one low compression cylinder. Approx. 120 hours on the guage. Selling complete motor and electronics, including...
  18. 3/8 DeWalt cordless impact to dissassemble. Will...

    3/8 DeWalt cordless impact to dissassemble. Will use to reassemble, but just to run the bolts in then hand tighten or torque.


    -Greg
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    I launch single trailer skis almost exclusively...

    I launch single trailer skis almost exclusively with my golf cart. Plenty of torque in an electric cart to pull a ski out of the water, but you have to be careful to not back the rear wheels over...
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    Most folks have moved to jetboaters.net. Many...

    Most folks have moved to jetboaters.net. Many more knowledge folks there.

    Basically the no wake feature has you put the bucket in neutral, then increases RPMs. Talk to these guys and see if their...
  21. Thread: Mystery Yamaha

    by boudin
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    OMG, it's just wrong. That is a VX110 hull and...

    OMG, it's just wrong. That is a VX110 hull and someone put a 2-stroke motor in it. Run away.

    -Greg
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    I go in thinking of two prices: (1) In good...

    I go in thinking of two prices: (1) In good running condition with no issues, and (2) everything else. The ski you are looking at is in the #2 category, and if the owner does not want to spend the...
  23. If you are moving the motor mounts for a 66V, you...

    If you are moving the motor mounts for a 66V, you mind as well put in a 4-stroke MR1. See recipes below.

    -Greg
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    As far as water boxes, I can't really say other...

    As far as water boxes, I can't really say other than the ski runs 52-53 mph, same as a stock early model VX.

    I have had this ski running about six weeks now and have ridden quite a bit. XLT hull...
  25. Might be tough getting an MR1 into that hull, and...

    Might be tough getting an MR1 into that hull, and you will need to move the motor mounts on the XL. My recent XLT/VX build thread is below. Different hull, and setup for a 66v 2-stroke, so the motor...
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