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  1. FS - Parts 66V 1200 Power Valve Engine Part Out (GP1200R, XLT1200, etc.)

    Selling the motors out of my XR1800 jetboat, in order to swap in FXHO 160 HP motors. I've already sold one motor complete. I'm parting out the second motor since it seems people are more interested...
  2. FS - Parts No one has destroyed a cylinder recently? Surely...

    No one has destroyed a cylinder recently? Surely someone needs a replacement :p
  3. FS - Parts More pictures 454464 454465 454466 ...

    More pictures

    454464

    454465

    454466

    454467
  4. FS - Parts Nikasil Plated Cylinder 1200 PV Motor (66V)

    Iím parting out my 66V motor since itíll probably sell better that way versus selling it complete.

    So as I take pieces off, this is the first piece for sale. OEM nikasil plated cylinder. I...
  5. FS 66V 1200 PV (GP1200R) Long Block Engine, Nikasil Cylinders

    Sold.
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    Any update?

    Any update?
  7. FS Pictures uploaded. As I said before, motor is...

    Pictures uploaded. As I said before, motor is still in the boat.
  8. FS 66V 1200 PV (GP1200R) Long Block Engine, Nikasil Cylinders

    Sold.
  9. Replies
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    SOLD View Post

    Still looking for a complete motor? Iíve got one, all cylinders Nikasil. Resealed the cases 2 years ago.
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    I would assume it has the catalytic converters...

    I would assume it has the catalytic converters then.
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    No, if the choke cable falls off, they just stay...

    No, if the choke cable falls off, they just stay open and youíre not able to choke the motor. Chokes are spring loaded. My guess is previous owner had the carb out, and forget to tighten the nuts...
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    Yeah man, I live and die by that manual. The rear...

    Yeah man, I live and die by that manual. The rear carb is setup identical to the front and middle.

    I need to get around to pressure testing the motor to make sure I donít have a leak.
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    Left motor spark plugs. Was bogging out today ...

    Left motor spark plugs. Was bogging out today

    Front
    450156

    Middle
    450157

    Rear
    450158
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    Took boat out again today. Left motor bogged and...

    Took boat out again today. Left motor bogged and RPMs were low. Like itís running lean.

    Right motor felt very responsive and strong, just like it did right before it melted the piston.

    Right...
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    Pop Off Too Low on Stock 1200 PV (66V)?

    If refreshing the fuel pump side of the carbs doesnít fix the issue, Iíll do as you said and pressure test the engine.

    I resealed the cases 2 years ago, and they held pressure. Didnít use the...
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    View Post

    It looks charred and burned. Doesnít look like a rich plug to me. I shouldíve taken a picture and posted it. Iíll try to get one when I get home tonight.
  17. Replies
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    Pop Off Too Low on Stock 1200 PV (66V)?

    So I got everything back together today, and water tested. I put in fresh spark plugs. Right motor with rear cylinder was where it had gone lean last time. So I cruised around for a few minutes at...
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    It was a used OEM piston. This boat had an SBT...

    It was a used OEM piston. This boat had an SBT engine in it (other was original) when I bought it. Being a rebuild, they used steel sleeved cylinders. I bought a package deal of OEM nikasil...
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    Got it. I honestly didn't know there was anything...

    Got it. I honestly didn't know there was anything in the piston groove, never saw anything in the service manual about it. Probably why I had such a hard time getting the rings compressed to where...
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    FS - Parts Anyone want this last set of t-handle adjusters?...

    Anyone want this last set of t-handle adjusters? Will do 3 carbs.
  21. Replies
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    Pop Off Too Low on Stock 1200 PV (66V)?

    Going back to Adam's comment, I'm looking at the exploded diagram for the pistons, and don't see a location pin? Everything shown in the diagram was recovered during tear down. Far as I can tell, I...
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    Talking about the drilled return mod that OSB had...

    Talking about the drilled return mod that OSB had posted? Yes, the returns are drilled out to 1/8" in each carb, and a 95 main jet placed in the fuel return line.



    Wait, what location pins?...
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    Pop Off Too Low on Stock 1200 PV (66V)?

    I think I have a pretty good understanding of engine theory, and I don't see at all how a reduction in back pressure calls for a smaller gapped plug. If you could expand on that further, that would...
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    How do d- plates affect spark plug gap?...

    How do d- plates affect spark plug gap? Everything I've read says the XR1800 has a higher powered ignition system, hence the larger gapped spark plugs.
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    Pop Off Too Low on Stock 1200 PV (66V)?

    Blew the rear cylinder on the right motor. Found that the center pulse line was off. Not sure if I forgot to hook it up or what.

    Left motor runs great.

    I was cruising along, seemed to run...
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