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  1. R

    Spark plugs for older Merc (80s)?

    I performed a compression test -n 130 and 135-40 ish on the other.. changed lower unit oil, changed fuel filter and spark plugs... engine is running beter! Feeling pretty goo about that! I am by no means a technical person! so thanks for your help, folks...
  2. R

    Spark plugs for older Merc (80s)?

    Also when performing a compression test should I disengage the fuel line?
  3. R

    Spark plugs for older Merc (80s)?

    Actually, the BP8H-N-10 is only $4.99 a plug. That's cheaper than all the other plugs I looked at. So this is the one I should get or the BPZ8H-N-10 (which is quite a bit more)?
  4. R

    Spark plugs for older Merc (80s)?

    So I'm a bit confused...I ordered Champion 827 L76V plugs. Should I not use these? Am I now going with NGK BP8H-N-10 OR BPZ8H-N-10 ? These are a lot more expensive by me...
  5. R

    Spark plugs for older Merc (80s)?

    those fuel filters are a real treat to remove. I cannot get that filter off... it must have never been changed!
  6. R

    Spark plugs for older Merc (80s)?

    Thanks... so the above serial number I posted - is this correct? Why is it not showing up?
  7. R

    Spark plugs for older Merc (80s)?

    This is the serial number I found. I looked it up and couldn't find anything on it. It's A701232
  8. R

    Spark plugs for older Merc (80s)?

    Sorry, I'm really inexperienced at this.. trying to learn as I go along... how do I ground the plug wires? thanks
  9. R

    Spark plugs for older Merc (80s)?

    So any risk of shock? If so, how do I prevent? TY
  10. R

    Spark plugs for older Merc (80s)?

    For a compression test, should I do this with a cold engine or warm? Are there any safety tips I should be aware of? I watched a Youtube video where the Youtube basically removed the boots and plugs screwed/attached the tool that comes with the compression kit and cranked the motor five times...
  11. R

    Spark plugs for older Merc (80s)?

    Well, it starts fine, runs pretty good in forward and reverse... it's the neutral position where it hiccups... stalls and sputters... weird. A mechanic at Basspro said it's likely carb issue... I am going to attempt a compression test. Bulb wasn't that firm.. what does that indicate?
  12. R

    Spark plugs for older Merc (80s)?

    Hey folks, where are the serial numbers on these motors?
  13. R

    Spark plugs for older Merc (80s)?

    I found this at one of our local box stores. Is this the one you are referring to? Champion 827 L76V
  14. R

    Spark plugs for older Merc (80s)?

    Thank you. to both.. will look up serial...
  15. R

    Spark plugs for older Merc (80s)?

    Hello folks, First time poster! I recently bought a 16' fishing boat paired with a mid-80s 18HP Mercury XD. The seller believes it is a 1985. I still need to confirm this. But when I googled images of 85 Mercs, they look the same. Motor is idling rough and stalling while in neutral. I am going...
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