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  1. Q

    83' 115hp Mercury, prop slip

    Hi. Yes. A 4 blade is never as efficient as a well chosen 3 blade.
  2. Q

    Swapping to an opti

    Good news is that the optimax is almost certainly going to be a smart craft compatible machine. Means you have a few wonderful options for gauges and data read out. I have the very very good SC1000 gauge instruments. Also have a VesselView mobile that displays all data on your phone or tablet...
  3. Q

    83' 115hp Mercury, prop slip

    If you want to reduce prop slip and see better efficiency cruising…a 4 blade is not the answer at all. Their efficiency and slip reduces hugely anything upwards of slow planing speeds. The issue you likely face with that particular set up, is inaccurate numbers from things like dash mounted...
  4. Q

    What hub do I need for an Alpha One prop?

    Hi. If you buy a new black max (or any new merc prop), you will get a flo torq hub kit supplied with it.
  5. Q

    17 vs 19 vs 21 Pitch?

    I’d say most 19” props will be around the 14” diameter size (off the shelf) for that set up. Something to take into account. Won’t have a huge impact, but maybe some. Should also be aware that you can occasionally see similar rpm results (but slightly higher speed) when going from a bigger...
  6. Q

    Hydro sheild

    Best of luck whatever you decide. Maybe I’m getting old ..but I’ve always been of the mind that nearly a century of R&D from the big brands that make outboards, might have suggested there isn’t a need for such things…or they would have changed the design by now. The only other reason I can think...
  7. Q

    Setting Timing on a 2002 VP5.7GXI-A

    Good deal. Glad she’s sorted !
  8. Q

    Smoking Engine and Mercruiser ignition switch question

    Was your outdrive tilted all the way up by any chance ? Either way…I would t be running any engine like this for too long on the muffs. If you need to…keep the revs low. Anyway. Best of luck.
  9. Q

    2024 75 Mercury outboard

    There is an analogue to digital module if you want the full unlimited use of the smart craft gauges. But I suspect that if you have analogue gauges and nothing works..and you have the analogue harness loom…there is something else going on. If you want to use analogue pitot Speedo for example...
  10. Q

    Anyone give me some info on this Engine please!

    Spot on above. Used to be about in the 70’s here in the UK. Not common though. Even back then.
  11. Q

    2012 seadoo rxp 260 only goes 30mph

    There is definitely something else going on here. Even the learner key fob will allow the ski to go fairly fast and certainly more than 10mph for sure.
  12. Q

    What's the round thingy,..??

    Yeah. Constantly rotates and doesn’t allow water to sit, obstructing view. Found commonly on commercial spec boats over the decades gone by. Pilot boats mostly all have these.
  13. Q

    Setting Timing on a 2002 VP5.7GXI-A

    Hi. This is often over complicated All you need to do is take the plugs out. Turn the engine to tdc on number one. Then you get the distributor assembly in your hands. Make sure the rotor is aligned with the very small “8” marking on the plastic casting of the lower housing…that’s where you...
  14. Q

    4.3 MPI Crank No Start / No Spark

    Hi. I’d check the following in this order Kill switch (sorry. Had to ask) The new coil. Are they getting continuity to earth back to the battery where they are mounted. The new cap. Is it installed properly. Is it just a new cap or a new whole assembly ? Are you getting a spark from the king...
  15. Q

    Tachometer Install

    You have the wires mixed up, I’d think. The meter is finding a path to ground or earth for it. See one of the posts above about wire colours and you’ll be right.
  16. Q

    Mercruiser 5.0 Mpi issue

    Not sure. There was a service bulletin about these things on a few occasions
  17. Q

    Mercruiser 5.0 Mpi issue

    Haha. There has been a fair bit of prop testing…but the overwhelming majority of the hours have been spent at either 1200 rpm or about 2500/2600 rpm cruising at around mid to late 20’s.
  18. Q

    Mercruiser 5.0 Mpi issue

    850 as of yesterday. 21 years old. She likely did well to last that long 😂
  19. Q

    Mercruiser 5.0 Mpi issue

    Hi all. Just closing the issue and post… Thanks so much to you all ! It was indeed the distributor at fault. The shaft had vertical play of silly proportions!! Was allowed to move that much, it was cross firing, hitting the cap with the rotor and all sorts. This all caused two of the plugs to...
  20. Q

    Mercruiser 350 mag mpi distributor timing

    Hi. Literally just done this with my boat. You need to make sure the bottom crank pulley is absolutely at the tdc markings. On the compression stroke too. Can be done with watching a compression gauge if required. Then. You need to look for the line or marking on the distributor shaft. Make...
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