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  1. J

    200 Mercury EFI - Interesting Situation

    So, I want to preface that I bought it off Facebook Marketplace. I took it out on the water with the owner, and there were no leaks, the steering worked, the Engine sounded good with the cowling on, and there were no noticeable issues. I bought it for 4500, and I took it to a mechanic to truly...
  2. J

    Trying to find out what engine - Need help

    How do you make that determination?
  3. J

    Trying to find out what engine - Need help

    I believe I have a 1990-2000 Mercury 175 EFI 2.5 liter, and this serial number is not showing up online. The serial number is 06230926. If someone could help me locate this. That would be amazing!!
  4. J

    Mercury classic 50 HP - part 2

    Thank you for all the valuable information that you all have taken the time to share to me. I want to learn further into taking apart my engine even further. As it stands I’ve taken off the exhaust cover, the bypass cover. I believe with enough time and tinkering I could put it back together as...
  5. J

    Mercury classic 50 HP - part 2

    How would I go about repairing this piston? It looks like this piston is never EVER supposed to come out of this engine block.
  6. J

    Mercury classic 50 HP - part 2

    https://forums.iboats.com/threads/low-compression-1986-mercury-classic-50.775479/#post-5951933 This is the original post and I’m making a sequel to that. In that post I basically discover that my top cylinder is giving me a compression of 30 to 40. When hot 100 I suspected there was something...
  7. J

    Low compression - 1986 Mercury classic 50

    Today I’ve spent my time removing my power head and water jacket and these images show my base gasket and my cover gasket next weekend is when I take apart the power head to investigate. Considering this is my first time some advice on what to check and what I should clean out or maintenance...
  8. J

    Low compression - 1986 Mercury classic 50

    Leaky water jacket and a leaky base gasket.
  9. J

    Low compression - 1986 Mercury classic 50

    I appreciate the time you took to write your suggestion. I’d like to ask another question that may be dumb. When I’m on the lake and and I WOT for about 5 minutes get to my fishing spot and troll for about 15 - 20 minutes and goto start the main motor it takes much longer to crank and get...
  10. J

    Low compression - 1986 Mercury classic 50

    I’m having low compression on cylinder #1 at 95 PSI when warm and 50 when cold. Cylinder #2 is at 125 Cylinder #3 is at 125 and Cylinder #4 is 115 Here’s a video of the engine running. I have an understanding that an engine with low compression tends to misfire and not start and if it does...
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