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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.
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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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    Yeah, I'd love to know why the GPR got 95 lows...

    Yeah, I'd love to know why the GPR got 95 lows and the XLT got the 87.5. The stock setting in the Yamaha manual shows both the low and high speed adjusters opened more on the GPR than on the XLT. So...
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    FS - Parts I set of t-handle adjusters left (3 highs and 3...

    I set of t-handle adjusters left (3 highs and 3 lows).
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    Pop Off Too Low on Stock 1200 PV (66V)?

    Good deal. Like I mentioned earlier, common consensus on the jetboat board I frequent is to swap out the 87.5 low speed jets for 95 jets to richen up the bottom end. Since you kept the stock 87.5...
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    Pop Off Too Low on Stock 1200 PV (66V)?

    Did you try idling it for an extended time and then going WOT? The arm spring doesn't affect starting?
  13. Would start by getting a rebuild kit for the fuel...

    Would start by getting a rebuild kit for the fuel pump.
  14. That one has the external fuel pump that sits on...

    That one has the external fuel pump that sits on the back of the carb rack, instead of a fuel pump on each carb, right?
  15. Will try when I get a chance. I'm out of town...

    Will try when I get a chance. I'm out of town this weekend, then traveling part of next week for work.

    I do know that when I played with the choke once the motors were running in the water, it...
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    FS - Parts Not complete ones. I have parts left over from...

    Not complete ones. I have parts left over from kits I've opened.
  17. Bogs down when given throttle, then clears up and...

    Bogs down when given throttle, then clears up and runs fine. If I cruise around, cut throttle, and get back on the throttle, it does fine. If I idle around, it bogs again when given throttle.
  18. That's what I did. And it's loading up when...

    That's what I did. And it's loading up when idling.
  19. Ok, but I think verifying pop-off is a good way...

    Ok, but I think verifying pop-off is a good way to double check that you don't have an underlying problem. The OP could have just thrown in what he thought were 1.2 N&S, 115 gram springs, and called...
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    FS - Parts 3 high speed adjusters and 3 low speed adjusters....

    3 high speed adjusters and 3 low speed adjusters.

    448895
  21. I know this thread is almost 4 years old, but I'm...

    I know this thread is almost 4 years old, but I'm having the exact same issue. 115 gram springs are popping off at 40psi with new 1.2 N&S that I purchased from Atlantic Jet Sport. I even purchased...
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    Yes. On all carbs.

    Yes. On all carbs.
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    Pop Off Too Low on Stock 1200 PV (66V)?

    Not sure what would cause me to be lean. I'm running the settings you suggested. Maybe I should put the 95 pilot jets back in? Over on the YamahaJetBoaters forum, it's common in the XR1800s to have...
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    Accelerator pumps on both carb racks verified...

    Accelerator pumps on both carb racks verified working while off the motor.
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    Pop Off Too Low on Stock 1200 PV (66V)?

    Sorry, staining my deck took top priority this weekend. Finally had enough days in a row without rain that we could pressure wash, let dry, and stain.

    I got the carbs back together today. Both...
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