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  1. roger3645

    Float setting 1991 70 hp

    This is a new to me motor and I suspect it has been setting up for a while so I decided to give the carbs a good cleaning, a decarb and change the impellar. This is also my first johnson. I must say it was easier to get the carbs off than the merc I had in the past. After cleaning the carbs out...
  2. roger3645

    Compression on a 1991 70hp Johnson???

    In the near future I'll be looking at 17' aluminum boat with a 1991 70hp Johnson outboard. This will be my first Johnson motor, all other boats have been powered by mecury. What would decent compression numbers be for this motor. And all should within 10 - 15% of each other ???
  3. roger3645

    350V Ranger/115 merc/Ballistic Prop

    I'm running a 1983 Ranger 350 V, it is powered by a 1988 mercury 115hp with a 13 3/8 X 19 Ballistic prop. The boat is 17? 10? with a 6? 10? beam and a dry hull weight of 1050 lbs. By GPS I?m toping out at about 46 mph @ 5900 rpms. According to the tach it?ll reach 5200 rpms with the motor...
  4. roger3645

    1988 115hp Merc won't shut off

    Hi All! I?m running a 1988 115hp merc, runs good. In fact so good it does not want to stop. I?ve changed the key switch in the remote control and that didn?t help. The only way I can get the motor to shut off is to press the choke button. Any ideas? Thanks!
  5. roger3645

    Ranger 350V Master Power Switch?????

    Just recently purchased my first real bass boat a 1983 Ranger 350V. The hull, floor and transom are in great shape and it?s sitting on a 2006 trailer. I bought the boat without a motor on it but I have a 1988 115 merc to put on it. Do these boats have a master power switch??? I?m not getting...
  6. roger3645

    How's My Compression?? 1988 115hp

    Hi guys, just trying to get a sense of this motor I recently purchased. 1988 115hp I-6, with 120 psi on all 6. Would you rate this as below average, average, above average, or great for it's age? Thanks
  7. roger3645

    5000rpm with 13 3/8 X19

    I'm running a 1973 850 85hp mercury on a 16' trihull bass boat with a dry weight of 850 lbs, hitting 35.6 mph (GPS) @ 5000 rpm at WOT. I bought the 13 3/8 X 19, SS Ballistic, for $50.00 bucks. Is it the extra 3/8 inch holding the rpms back, or can I send the prop to a prop shop to change it to...
  8. roger3645

    Did i buy junky mercury controls??

    Just received two used 8 pin merc controls with the warmup lever. Just the control boxes and wiring harnesses no cables. I cannot get either control lever to move into the forward gear position. Is this some sort of safety feature as not to start the engine with the motor in gear??? The...
  9. roger3645

    Which Remote for 1988 115

    I?ve recently purchased a 1988 1115hp (inline 6) merc with p/t. It has an 8 pin female connector for the remote control. I?ve been looking at used ones on ebay . There are two types that have an 8 pin male connector. One has a warm up lever while the other has a push button throttle advance on...
  10. roger3645

    Should I add Power Trim?

    I’m running a 1977 tri hull bass boat with a 1975 85 hp mercury that does not have power trim ( with 135 psi in all 4 cylinders). With the manual trim I have the trim pin in the second hole from the bottom. The dry weight of the boat is 850 and I’m running at 5300 rpms WOT, with an aluminum 3...
  11. roger3645

    1973 850 What Size Fuel Line?

    Trying to find the correct size for the fuel lines running to the carbs. From the fuel pump and carb to carb. Thanks. It appears to have 1/4" right now. I think they are too small.
  12. roger3645

    850 LU exchange 73 to 1975

    I’m running a 1973 850 mercury and have developed a problem with the lower unit. Basically the threads that hold the thrust nut are almost gone and comes lose from time to time. I have another lower unit from a 1975 850 but it is just a bit longer than the 73 model. It bolts on just fine but is...
  13. roger3645

    Will a bad stator cause this?

    I'm trying to find the cause of my 1975 850 merc cutting out at high rpms. I've replaced the fuel pump, cleaned carbs, have a good firm ball, and done the timing and sync of the carbs. It runs good and idles good just cuts out at high rpms then it'll start right back up. Can this be a bad stator?
  14. roger3645

    Nagging problem w/850 merc cutting off

    Okay I’ve had this issue with this motor since last summer and it’s driving me nuts. 1975 850 85 hp merc. Problem is it’ll just cut off while approaching high rpms and then it’ll start right back up. What I’ve done so far: Removed and cleaned carbs, ran 3 treatments of sea foam thru it. I’ve...
  15. roger3645

    Need 2 props for 2 boats

    Okay here goes. I’ve have two boats and yes the wife says one has to go, but I only have one old 2 blade bronze prop (13.5 x 19p) to share between them and the pitch is low for both boats.<br /><br />#1 1977 16’ Tri-hull fiberglass bass boat 850 lbs dry weight. Powered by a 1975 850 85hp merc...
  16. roger3645

    Sea Foam and Compression Results

    1975 Merc 850, has good compression in all cylinders except #3 which was at 90 PSI. After 2 sea foam treatments #3 is now a bit over 100 PSI and other 3 remained about the same. Should I give it another sea foam treatment? I have not had it in the water since treating the motor with sea foam...
  17. roger3645

    Driveshaft Swap 650 into a 850

    Have a 1973 850 with a pitted driveshaft. I'd like to know if I can swap out the 850 shaft with a shaft from a 70's model 3 cylinder 650.
  18. roger3645

    LU shift shaft bushing removal 75 850

    The shift shaft on the lower unit of my 1975 850 merc turns freely without engaging any gear. It's currently in fwd. How do I remove the bushing that secures the shift shaft? Do I need a special tool or can I tap it in the notched areas with hammer and screw driver?
  19. roger3645

    850 merc jumped the red and white post power pack

    I’m running a 1975, 850, 85 hp mercury. I previously posted that I’m having a problem with the motor cutting off at WOT. Also there was a humming or clicking noise coming from the area of the key switch in the control box. It was suggested that I use a jumper wire to connect the red post to the...
  20. roger3645

    1975 850 merc just cuts off at WOT

    I’m running a 1975 850 85 hp mercury serial #4300733. Yes and I’m very glad that it still runs as well as it does. The only problem I’m having is it will just cut off. This occurs at WOT. It will run for a while at WOT then just shut off. Just like flipping a light switch. It will start right...
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