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  1. O

    Tilt Trim for 1977 75HP

    Does anyone know the p/n for the hydraulic pump for 1977 75HP? I'm thinking of adding the function to the motor I have.
  2. O

    Mercury 850 reed problem?

    I'm in the process of reviving a 1977 Mercury 850 that's been in storage for 30 years. I have replaced stator, trigger, fuel lines, rebuilt fuel pump, impeller, replaced crusty engine wiring, cleaned carbs, replaced needle and seat. Engine runs well at medium to high speed, but idles rough...
  3. O

    1977 85HP 2-stroke bogging

    After taking the engine out of storage for 30 hrs, replaced trigger and stator due to disintegrating wires. Replaced most of the wires in the internal wiring harness. All new fuel lines, rebuilt fuel pump. Carbs were super clean on the inside so I didn't fully rebuild; just new needle and seat...
  4. O

    1977 Mercury 85HP Engine Harness Confusion

    photos to go with text post:
  5. O

    1977 Mercury 85HP Engine Harness Confusion

    I had to replace some of the wires in my original engine harness as insulation was crumbling. p/n 84-73369. I THOUGHT I replaced the wires with correct color coding, but now I'm second guessing myself (as engine is still having electrical issues even though it's got new stator, trigger, and...
  6. O

    Weak Spark

    1977 Mercury 850 had been in storage for 30 years. Ignition is single switchbox, 4 coils, trigger, stator. I replaced trigger (wires were toast), repaired some of the stator wires (insulation was cracking and some of the copper wires were sketchy), and did other things to get the engine ready to...
  7. O

    Is Switchbox Bad?

    1977 850 Ran fine, and then died suddenly. The Engine has been in storage for 30+ years on a boat we recently bought. From a different post, replies sound like age alone is not a cause for a Switchbox to go bad. Recent history: Insulation on trigger (and some of wiring on stator) were crispy and...
  8. O

    How Long will the Switchbox last?

    1977 85 HP Mercury outboard has been in storage for 30 years. We are putting it back in service. Trigger and Stator have been replaced. I know that in old audio equipment, capacitors typically fail due to age. The Switchbox is original (1977 vintage). I'm thinking the capacitor (or other...
  9. O

    1977 Merc 85HP -- what does "Balance Hose" system do?

    From the marineengine.com parts info, an illustration for 85HP Merc shows what I think is the cylinder bleed hose (0.077 I.D.) #17- #20 on the left (which is mounted towards the rear of my engine), and on the right side of the illustration is shown the larger-diameter "balance hose" #21-#25...
  10. O

    1977 Mercury 850 internal fuel hose?

    I (may have) figured out part of the puzzle. From the marineengine.com parts info, an illustration shows what I think is the cylinder bleed hose (0.077 I.D.) #17- #20 on the left (which is mounted towards the rear of the engine), and on the right side of the illustration is shown the...
  11. O

    1977 Mercury 850 internal fuel hose?

    Sorry; the images aren't very clear...but in image 2, the tube is already connected to fittings at the top and bottom. The image 2 tube is relatively small diameter (roughly vacuum line sized; I believe it's the cylinder bleed hose @ 0.077 I.D.) The image 1 hose is the diameter of the fuel...
  12. O

    1977 Mercury 850 -- How essential is the mercury tilt switch?

    1977 Mercury 850 is coming out of storage after 30 years. Compression is good, and I was told it ran great when it was stored. We'll see. I'm replacing fuel lines, replacing crispy wiring, replaced the trigger, and will remove the carbs to clean any accumulated debris. The blue mercury tilt...
  13. O

    1977 Mercury 850 internal fuel hose?

    What is the rubber hose (factory painted black) that runs vertically at the front of the motor (behind the starter motor flange in the photo)? At the bottom fitting, there's a small tube that runs to the front of the lower cowl. At the rear of the motor, there's a small tube (also factory...
  14. O

    1977 Mercury 850 power trim

    I'm thinking of adding power trim to 1977 Mercury 850 that doesn't currently have it. I'm not sure how feasible this is. I assume I need the externally-mounted hydraulic pump, hydraulic lines, and to change the manual lift cylinders to hydraulic ones. Does anyone know what the associated part...
  15. O

    1977 Merc 850 internal fuel-line and internal wiring

    For 1977 850 4cyl, what's the correct size for internal fuel-lines (to carbs, etc); 3/8" I.D. or 5/16" And for replacing the various rotted signal wiring, is 18 AWG wire ok? Thanks.
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