Search results

  1. roger3645

    #3 Plug not firing for 1st 10 minutes

    Running a 1991 Johnson 70hp on a 16? aluminum bass boat. I only have this problem after initial start up. When I first start the motor and head for my first spot, the number 3 spark plug will not fire. After about 10 minutes the plug will start firing and it will run good the remainder of the...
  2. roger3645

    High idle problem found 70hp

    This is an update, just wanted to throw it out there since I found the problem with the high rpms. I?m just stumped on this one. I?m running a 1991 70hp Johnson. It first started acting up when it would not get my top rpms, would not run over 4000 rpms. After going over the fuel system, taking...
  3. roger3645

    Running temp 1991 70hp Johnson

    Have a 1991 70hp Johnson and I recently installed a temp guage and new impleller. At idle there is very little water coming out the exhaust ports but I have a good stream out the T-tail. Temp will go to about 170 degrees. When running the motor the temp drops to 130 degrees. Is the idle temp too...
  4. roger3645

    LU swap 1987 70hp to a 1991 70hp

    Well now that I bough it, let me ask. Can I use a LU from a 1987 70hp Johnson on a 1991 70hp Johnson? Price was to good to let go so I bought it before checking. Nothing wrong with the LU on my 1991, just picked this up as a spare. Thanks
  5. roger3645

    70hp Johnson will not idle under 2500 rpms

    I?m just stumped on this one. I?m running a 1991 70hp Johnson. It first started acting up when it would not get my top rpms, would not run over 4000 rpms. After going over the fuel system, taking apart and cleaning the carbs and fuel lines, still the same. Then it got worse and I noticed the...
  6. roger3645

    70 hp, Thought I had it fixed BUT NOT

    Okay this is what I have and what I have done. I have a 1991 70hp Johnson. It?s new to me since Jan 08. Compression is 120 psi on all three. I have decarbed the motor with 2 treatments of sea foam, and replaced the plugs. I have blue spark that will jump a 7/16 gap. I took apart and clean the...
  7. roger3645

    What caused this??? Can U Guess???

    Okay guys, I?m running a 1991 70 hp, on a aluminum bass boat. It?s new to me. I?ve had it out three times and each time it ran different. I found the answer here on Iboats. Poor idle , poor WOT would surge and miss, plugs kept fouling, and the last time out (after tearing apart carbs and fuel...
  8. 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...
  9. 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 ???
  10. 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...
  11. 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!
  12. 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...
  13. 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
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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.
  19. 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...
  20. 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?
Top