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  1. Scott06

    2006 Mercruiser 5.0 2bbl Misfire/stumble once warm

    2006 will be 3 wire, but doesnt mean the sensor isnt bad. Agree with check fuel pressure. Would be interested to use a spark gap tester when cold and after sitting hot. Would also check to see if fuel is leaking into intake after shutdown and choke is fully opening. What do spark plugs and...
  2. Scott06

    temperature on Mercruiser 4.3 LX

    Yes that’s why I said you are fine Check out the exhaust temp close to the manifolds at the exhaust ports … that will be much hotter
  3. Scott06

    temperature on Mercruiser 4.3 LX

    you are fine then
  4. Scott06

    temperature on Mercruiser 4.3 LX

    you outline normal temps 65-70 C (is 148-158F) if has the exhaust cross over and is 80 c that is normal in my opinion. with the laser what is the thermostat housing ? I assume it is 65-70 C? sound like all is running well. when was last time water pump impeller was changed in drive? I'm not...
  5. Scott06

    Wont fire on plugs

    so everything checked out ok? you said you put new cap and rotor on is the button missing from cap to contact the rotor?
  6. Scott06

    Learning to wake board at 48. What am I doing wrong?

    you are in same boat i am. You can do it from back of boat I just found it much less exhausting to get up with the tower. Also I found I had to drive differently than towing a skiier, easing into the throttle more getting up then much much slower. If you get a smooth day outside the wake on a...
  7. Scott06

    So, my 2025 Bayliner VR5 200 hp 4.5L mercruiser STILL barely pulls me up

    Sorry - not higher pitch, I meant the prop design is different than what you are running. You would use a prop with more cupping in similar pitch to what you are running. Typically if switching from say 15" pitch basic aluminum like a black max prop, I would go down in pitch when switching to...
  8. Scott06

    So, my 2025 Bayliner VR5 200 hp 4.5L mercruiser STILL barely pulls me up

    mercruiser has set up drawings on their website of the X dimension that is height off the bottom for the crank center line and thus keyhole. I doubt its off as if it were too low your front motor mounts would be bottomed out on the stringers If you cant use any trim try a prop with more bite...
  9. Scott06

    3.0L Mercruiser - No Power Under Load

    Would check if the ignition is advancing and more on what led you to replace the carb.
  10. Scott06

    Wont fire on plugs

    JustDisconnect the wires when connected together it will supply the 12 v to kill the igntion
  11. Scott06

    Prop Advice: Rev4 XP on 383 Stroker

    The 200 rpm per inch of pitch up or down really only holds true if you are talking the same prop. Going from a basic aluminum to a rev 4 xp is a world of differnce in terms of bite on the water . I have a similar size boat and with a revolution 4 (non XP) think I am at 11% slip. The rev 4 has...
  12. Scott06

    Wont fire on plugs

    When you say it was by passed you mean disconnected or did you connect the wires together Or jumper it out attached is a wiring diagram for a 3.0 with a delco est , which is what I assume you meant by HEI igntion. If by chance you have an aftermarket HEI, will need to know what you have to help
  13. Scott06

    Wont fire on plugs

    I dont think 3.0 s used TB , I believe they were all delco est in recent years, DDIS or points before that
  14. Scott06

    So, my 2025 Bayliner VR5 200 hp 4.5L mercruiser STILL barely pulls me up

    Yes I think I had it on for 8 years or so. This was the older design where you drill 2 holes in cav plate , cracked right at the holes. Boat was fresh water its entire life alph gen one drive . i got similar results to you better holeshot and lost a little top end same situation trying to ski...
  15. Scott06

    Mercruiser trim up and trailer up non functional.

    Would agree if no 12 v coming from switch to solenoid That it’s the switch. Hopefully it’s not too hard to get to in controller
  16. Scott06

    Wont fire on plugs

    Have you disconnected the shift interrupt switch ? If it is tripped it will kill spark. Disco it and test
  17. Scott06

    Is pulling engine mandatory or just convenient or overkill

    Yeah must pull engine .i would not mess around with a broken flange . Just pull the nine and replace it. It isn’t that much work on typical stern drive boat to pull engine as long as you have the lifting device
  18. Scott06

    Quick Listen: What's this engine noise?

    Take of the drive belts and run it
  19. Scott06

    So, my 2025 Bayliner VR5 200 hp 4.5L mercruiser STILL barely pulls me up

    You should try the 15” or 16” prop I ran a 4 blade 16” on my 3.0 powered boat made a big diff in water starts. I also had a hydrofoil that helped until it snapped the cav plate. Your boat is the 200 hp version, my understanding is the ecu is only change for the 250 hp version. Not sure if the...
  20. Scott06

    Mercruiser trim up and trailer up non functional.

    I think the key is determining if you are getting 12 v to the up solenoid when toggling the trim and or trailer button. based on what you outline I would think intermittently you are not getting the 12 v to fire the solenoid. To test you could jumper 12 v directly to the solenoid where 12 v...
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