Recent content by Markslund

  1. M

    1985 Mercury 75 hp with Triangular Fuel Pump

    Hello all, I just want to put this out there...I was having issues of bogging down at speeds above idle. It was not getting sufficient fuel to keep up. I spent a lot of time and $ replacing parts, rebuilding carbs, and trying to adjust. What I finally discovered was that my triangular fuel pump...
  2. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    THANKS CHRIS OLSON! You put a lot of time into helping me and I appreciate you very much for that! My motor is now running great and I look forward to many hours spent on the water. I hope that others too may benefit from this post, especially after you uncovered the errors that have been...
  3. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Thanks Chris Olson. This is very helpful. I'm getting very frustrated with the downloaded manual I have from PDF Manual Publisher 2005. It is very sketchy. Any recommendations for a better manual going forward? In your step 4, can you identify from the picture below can you identify the...
  4. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    I do have a service manual and I just read through the steps again for the Idle Mixture Adjustment. Once again, the way I read it, after I have adjusted the idle mixture screws on each of the carbs, it then states to adjust the Idle Stop Screw to the 550-650 range. Please see below snip...
  5. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    OK Thanks for your reply. I have a few questions. Sorry, I'm learning. Below is a picture of what I was adjusting that I thought would simply bring the idle up and down. It wasn't really responsive in that way. In fact after I messed with it I had a really hard time starting and keeping it...
  6. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    UPDATE: I went back to my fuel pump. I had replaced the diaphragm awhile back before this weird issue started. At that time my motor was surging at idle. I read that it was a classic fuel pump issue, so I obtained a replacement diaphragm from a local repair shop. So until now I had ruled out the...
  7. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Thanks for the detailed info. I appreciate it much.
  8. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Racerone: If it were not for others on this forum that truly want to help without the overtones and sarcasm, I would not be wasting my time here. FYI: I have spoken with my local Mercury dealer, and had another experienced mechanic look at it. I’m just a newbie (seaman apprentice) to this form...
  9. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Thanks Chris Olson: This is very interesting. I have not heard or read about this. Would you mind explaining how the reed block works? Is it a thermal break that somehow resets when cooled? Or is a reed block something that is just mechanical (meaning nothing to do with overheating)? Could it...
  10. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Thank you guys for your all inputs. I just wish I knew someone who either has my same motor or has actually had it in their hands and could definitively say yes, you have a thermostat, yes you have a thermal sensor, and yes there is or is not a “limp mode” on this model. I can’t physically see...
  11. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Thank you guys for your all inputs. I just wish I knew someone who either has my same motor or has actually had it in their hands and could definitively say yes, you have a thermostat, yes you have a thermal sensor, and yes there is or is not a “limp mode” on this model. I can’t physically see...
  12. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Thank you guys for your all inputs. I just wish I knew someone who either has my same motor or has actually had it in their hands and could definitively say yes, you have a thermostat, yes you have a thermal sensor, and yes there is or is not a “limp mode” on this model. I can’t physically see...
  13. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Interesting. I just don’t see any signs of anything getting wet. I wasn’t aware of a voltage difference in stators. When I suspected a bad stator and pulled out the old one, it was black. I just replaced with what I read was the CDI replacement. It is not black, and not really red either
  14. M

    1985 Mercury 85hp (4 cyl) runs great for 20 minutes then boggs down

    Ok, I think common consensus is that item 35 is the OT sensor. You sound pretty confident that I indeed have a thermostat on this motor, while Chris1956 doesn’t believe it has one. ?? Thanks
Top