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  1. J

    When are 1991 Mercury 115 2+2 cylinders 3 and 4 supposed to cut in?

    Ran it on the lake yesterday for first time after the rebuild. I noticed that one cylinder cuts in at about 2000 RPM and the second one at about 2500. Is that normal? Does the lower one cut in first?
  2. J

    How does thermostat work on 1991 Mercury 115 2+2 ?

    I ran it on the lake yesterday for the first time after the rebuild. I noticed that at idle the temp climbs to about 140F (I have a 143F thermostat and the water temp was about 55F). At higher throttle (greater than about 1800 RPM) the temp drops down to 100F. Is the poppit valve opening or...
  3. J

    1992 Mercury 115 clean and dirty plug?

    I just rebuilt my 1992 merc 115. I have been running on 25:1. I looked at the plugs after an hour of idle time and found plug #1 with dry carbon. #2 is sparkle clean? I pulled both boots while the engine was running and both are firing. (#3 and #4 are clean but aren't getting fuel at idle per...
  4. J

    What Mercury piston part number IS this?

    This piston was made in Argentina and is marked "Persan" and "582" and "S" on the inside. It's also stamped HD on the inside. The top of the piston is marked L7,.015,89.175+0.100. The box says "Argentina", 0.015, c5822042. This may not be the original box. Doing an internet search, this may...
  5. J

    91 Mercury 115 Rebuild - Let's see how it goes!

    I started with a good 84 Merc 115 and a Bass Boat with a rotten transom given to us by my wife's uncle. The Bass Boat wasn't really convenient so I searched for and found a good deal on a Sea Ray 160 Bow Rider with a 91 Merc 115 with a bad cylinder. The boat, motor, prop were in like new...
  6. J

    Is freight for a power head really $500?

    I was thinking about buying a used power head and having it shipped from TX to OH. All the estimators I checked were around $500! Any ideas or particular places to check?
  7. J

    91 Mercury 115 Powerhead Swap With 97 125?

    How do I cross reference power heads to see which power head I could swap? In particular, could I swap a 1997 125 power head for my 1991 115 power head? Would my 115 carbs work if I rejetted them? (My 91 115 has a bad cylinder).
  8. J

    Mercury Quicksilver Control Repair

    The throttle only button in my Quicksilver control started sticking in and the control just wasn't working as smooth as it should. So I decided to buy a new one. Maybe a new Mercury control or a Teleflex CH1751P Osprey. YIKES! $300! So I next decided to tear into the old one to see what was...
  9. J

    89 Sea Ray Power Steering Question

    Re: 89 Sea Ray Power Steering Question Does it look like this picture (Morse steering on my Sea Ray 160 with Mercury 115)?
  10. J

    1984 Mercury 115HP In-line 6 lost sparks, keep idle stabilizer?

    Re: 1984 Mercury 115HP In-line 6 lost sparks, keep idle stabilizer? Removing the idle stabilizer was an easy decision - see picture. This wasn't apparent until I removed the switch boxes and related wiring. Also it was very easy to remove the flywheel nut. I bought a very nice strap wrench at...
  11. J

    1984 Mercury 115HP In-line 6 lost sparks, keep idle stabilizer?

    During the last outing on the lake I noticed I lost 1 cylinder. It would come in and out so I figured it had lost spark. By the time I got home and tested with a spark gap tester I found I had lost spark on 1,3,4. I then prepared to check the compression on all cylinders before isolating which...
  12. J

    115 Inline 6 Temp Sensor and Over Temp Switch Questions

    I'm putting a 1984 115 Inline 6 onto my new to me bowrider. I would like for both the temperature and water pressure gauges on the boat to work as well as the overtemp warning buzzer. The old boat I took the motor off of had only a water pressure gauge, so the motor apparently does not have the...
  13. J

    What is the part number for the Mercury Tilt Caution Decal?

    I'm doing some spit and polish on my boat/engine and I want to replace this decal. Does anyone know the part number or a source? Thanks, Mike
  14. J

    Morse C-3000 Hydraulic Steering Fluid

    I have a 1991 Sea Ray 160 with Morse C-3000 Hydraulic Steering. What was the original fluid? I looked in the manual and it could be ATF or light hydraulic oil. I was thinking it could be Sea Star oil, but that may not be the case. Also, does anyone know how to disassemble the hydraulic...
  15. J

    Mercury 115 4 cyl first steps?

    I just purchased a great boat and trailer with a 'bad' Mercury 115 4 cylinder (1991). (I have a Mercury 115 6 cyl to put on my new boat from my old boat.) The previous owner was told by the marina that the old 115 4 cyl motor has a low cylinder. The prevous owner said it would start and idle...
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