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  1. Scott06

    Top end speed

    Not likely you need more power to go faster as jimbo laid out I had a similar size boat with 3.0 for many years. Was reliable fuel efficient and easy to work one , but speed was not its game. I used 4 blade Michigan vortex props for low end grunt spend many an hour towing kids at 4k rpm Best...
  2. Scott06

    Moved motor from ski boat to pontoon what prop should i change to???

    Might work but I would think a 9 would raise it 1200 rpm or so vs current 15” … still too low and lugging
  3. Scott06

    Moved motor from ski boat to pontoon what prop should i change to???

    Not sure what the recommended wot rpm of your engine is. Would assume 5500 Or so I think based on the fact your current prop is a 15” pitch you need like a 9” pitch, which is really low. You may need a different gear case to push a pontoon as based of the numbers given I don’t think you can get...
  4. Scott06

    Water leak to the bilge from transom please help

    If you can i would keep it on a trailer vs leave it in the water, use it this summer and fix over winter. in theory you Keep an eye on it if u leave in the water but that would worry me Unless there is someone to watch it daily….then make sure your bilge pump works and you have a charger for...
  5. Scott06

    Boat hit 200 degrees engine temp

    Use OEM merc impellers , read a lot of comments like this where rubber separates from shaft sleeve… i assume yours was aftermarket?
  6. Scott06

    1987 MerCruiser 3.0 Flywheel size

    Yes 14” flywheel was part of move to single rear main seals. If the OPs engine is original it will have the smaller flywheel. I think 1990 (engine manufacture year) was cut over date
  7. Scott06

    Which carb kit please?

    https://www.carburetor-parts.com/mercarb-carburetor-kit they also sell brass floats to replace foam ones that are fragile .
  8. Scott06

    2015 Mercruiser 4.3L TKS - Engine stall after 30 minutes; Unable to restart at 1/4 throttle

    What do spark plugs look like ? Agree sounds fuel or carb related.When it happens look to see if fuel comes out of accelerator pump nozzles when throttle is pumped.
  9. Scott06

    Lost trim gauge and water temp indications

    The trim sender wires come out of transom and go into the engine harness and make their way up to the helm. The trim limit wires go directly to the trim pump
  10. Scott06

    early 70's Mercruiser 165hp inline 6 w/ MC-1 drive not going into gear (sometimes)

    I would think testing the shift cable by removing it from the shift plate and operating it - does it go smoothly with two fingers, would also remove the drive and make sure the shift shaft is swiveling freely look at how the shift shaft turns on the drive - the angle to make it into gear. Might...
  11. Scott06

    Camshaft Replacement on Vortec 4.3L 262

    https://www.ebay.com/p/1594440008
  12. Scott06

    Need advice from experienced people.

    Best bet is find a factory service manual for your engine. There is a link in the stickies of how to tune up your points ignition (assuming it is points)- but link is broken can PM a mod to see if you can get the correct link . Usually the timing is on the valve cover sticker or flame arrestor...
  13. Scott06

    Need advice from experienced people.

    It can set the timing to factory specs , if your total advance is low you wont make full power thus limiting top speed. Too much timing can lead to detonation that can destroy the engine
  14. Scott06

    1995 4.3 liter mercruiser

    The other two studs probably go on the starboard front engine mount. Two of the three fasteners on mine were studs to mount the fuel filter bracket
  15. Scott06

    Need advice from experienced people.

    Would think that boat would if properly proper do low to upper 30’s if it was running right . Did u do a compression test after what serial number we can tell I what the ignition timing is supposed to be
  16. Scott06

    GM 5.7L TBI & Thunderbolt IV compatibility

    You will need a low pressure marine fuel pump and wire it through a oil pressure switch so it wont run if ignition is on but engine isnt running . Search the threads you will see wiring examples for this safety feature. is your q jet an electric choke or divorced heat stove? If heat stove you...
  17. Scott06

    New Boater Prop Troubles!

    107 is essentially a dead cylinder. You don't put oil down the hatch you put it in spark plug hole it will help rings seal if they are shot. Check that valves are closing in cylinder 2
  18. Scott06

    GM 5.7L TBI & Thunderbolt IV compatibility

    Automotive tbi will not be marine rated for fuel and electrical safety stay with the carb assuming it is a marine w jet You need an 8 bolt vortec intake Michigan motorz sells a decent cast iron one. You may have an issue with pulley alignment but all else should carry over Flywheel may be...
  19. Scott06

    Can I use slightly longer push rods than stock on 454 Gen V?

    Motor year and boat year are two different things
  20. Scott06

    Cylinder pressure be on a mercury 175 sport jet?

    Dont buy it if u cant water test it
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