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  1. Q

    How much outboard motors have improved.

    Apologies flying Scott. Was getting mixed up with another subject about a 4 stroke efi motor.
  2. Q

    How much outboard motors have improved.

    Ok. Fair play. I was thinking of another post featuring a modern efi 4 stroke. Apologies
  3. Q

    How much outboard motors have improved.

    No doubt the consumption is a mystery…but also no doubt that a modern motor like that just won’t run like it is if the fuelling isn’t right. Just simply won’t achieve much at all. The fuelling will either work or it won’t on modern engines.
  4. Q

    How much outboard motors have improved.

    Confused by this statement.
  5. Q

    Water in Engine Oil 5.0 Liter MPI 2002

    Sounds like you’ve had a hell of a time of it. Likely one of the guys more knowledgeable than I, might have a better notion on things.
  6. Q

    Water in Engine Oil 5.0 Liter MPI 2002

    My goodness. That’s an incredible thing for an engine to lock up at high rpm, then rotate in reverse too…as a result of the drive locking up…did you verify and witness this or did someone tell you this ? Almost unimaginable
  7. Q

    Prop help 75 hp 4 stroke mercury

    Hi. I’d be quite sure it’s just as a result of a light boat, with a heavy (if the engine is the same age or early 4 stroke) heavy lump on the back
  8. Q

    Water in Engine Oil 5.0 Liter MPI 2002

    What was the reason for replacing the gaskets previously? Suspect your answer lies around there. An unusual event to have to do this on these, without having some sort of serious event. Like an overheating perhaps. Can often have further issues if so, should the heads or their mating face have...
  9. Q

    1400 RPM loss from 13 to 15 pitch!!!

    Likely correct…especially with the rpm range and peak power being as it is…but be great to get the details and numbers verified first off, I think. Huge gaps and discrepancies currently. The mention of 0% slip and 1% slip tells the story. Further confused me, after I ran the numbers, getting...
  10. Q

    1400 RPM loss from 13 to 15 pitch!!!

    Here is what I got for the 15”. This and the above at 20% ish slip…might even be the norm for a pontoon perhaps. Either way…there is definitely a fair bit of variation or uncertainty around the numbers perhaps.
  11. Q

    1400 RPM loss from 13 to 15 pitch!!!

    So just had a wee play with your numbers suggested above, with the 30 mph…5700rpm. Came out at 22% slip for me…assuming it’s the 1.83 gear ratio and 13” prop. Defo worth another run out to double check the data.
  12. Q

    1400 RPM loss from 13 to 15 pitch!!!

    Ok. So you definitely need to go out and have another run. Zero prop slip is an impossible result. Not having a go by any means. Just trying to help. But yeah, certainly need another few tests. It’s just not possible to get that slip figure. Keen to help out if I can. Do you know what gear ratio...
  13. Q

    1400 RPM loss from 13 to 15 pitch!!!

    I think it’s definitely strange, but have a read at my earlier post. The numbers just aren’t correct or even possible. Haven’t checked the slip and details for myself…but your own suggestion of 1% slip…just isn’t at all a possibility. Definitely worth another run out to check the numbers again...
  14. Q

    Vista 275 2013 Mercury engine 350

    The alarm on these can mean many many things. But to do this is suggesting a full guardian mode. I’d suggest you start with looking at the temperature when this happens.
  15. Q

    Mercury 1997 175HP EFI suddenly loses all power under load

    Good call above there. But I’d go out and check and monitor the voltage reading, when this happens. See what you see.
  16. Q

    1400 RPM loss from 13 to 15 pitch!!!

    I’m of the opinion that the slip number of 1% is very telling. Really need to do another run and be certain of the numbers. Especially since the 13” prop is showing an uncertain rpm figure too. Apologies for doubting the numbers, but they just don’t make sense at all. That engine has a rpm range...
  17. Q

    1400 RPM loss from 13 to 15 pitch!!!

    The analogue gauges never do, I’ve found. But be an unusual thing to be able to calibrate the gauge perhaps. Fair play.
  18. Q

    1400 RPM loss from 13 to 15 pitch!!!

    The slip numbers give away that one or more of the data collected isn’t accurate. If you don’t mind me suggesting so. Suggests that the actual rpms were in reality a good bit higher, to bring the slip into the realms of normality. You’ll no doubt know yourself, that 1% slip is almost impossible...
  19. Q

    1400 RPM loss from 13 to 15 pitch!!!

    I’d also say that it may well be explained by the engine not being into its rpm range with the 15”. All the power is in the stated rpm range, which I’d guess starts at at least 5000ish rpm. More rpms comes more power. More rpms comes more lift from the prop too So many variables and dynamics to...
  20. Q

    1400 RPM loss from 13 to 15 pitch!!!

    Hi there. Don’t take this the wrong way…but are we saying that these numbers were all taken from the vessel view (it’s rpm and gps speed)….or are we saying that these numbers were taken using analogue gauges that seemed to match the VesselView previously? Just trying to be sure around things, to...
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