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  1. jimmbo

    1986 merc 40hp 4cyl

    That Motor has been around since the late 50s. For many Years it was known as the 50hp. In the mid 80s, Mercury Prop Rated the Engine, as a 45hp, then a 40hp. Get a Factory Service Manual for that Engine as it will have the Info you will need to rebuild and readjust the Linkages after...
  2. jimmbo

    1993 Evinrude 70hp Missing Prop, Seeking Recommendations

    There is an Easy way to get the Weight. Weigh the Boat and Trailer, unhooked from the Tow Vehicle(get it off the Scale), then go launch the Boat, return with the Empty Trailer and do the Solo Weight thing again for the Trailer. Even 1200lbs for an 15-16 ft Hull seems a bit high BTW, water is...
  3. jimmbo

    Choke stays closed

    Maybe because the Chart shows it is supposed to be on #7. However, Now you say the Choke works on #7, earlier you said it is always on when on #7. Maybe Power is being applied to the Circuit other than by the Choke Switch. Since you say it happens with 2 different Control Boxes, start looking...
  4. jimmbo

    1986 merc 40hp 4cyl

    You are aware that, your Engine does not have a removable Cylinder Head? Pop the Transfer Port Cover off and check to see if the Rings have tension, and to see if the Piston Skirt is scored. If you have a Fiber Optic Camera, stick it in the Spark Plug Hole and take a Look at the Cylinder Walls...
  5. jimmbo

    Choke stays closed

    So when you got it, the Purple and White was on the Wrong Terminal(#6), and the Solenoid was super Hot? Yet when you moved the Purple/White down One Screw(#7), the Choke was always on? So was it Super Hot then?
  6. jimmbo

    Choke stays closed

    If you have a 78 motor, why are you Googling info about a 74? There are Many Differences between the Engines of those 2 Model years
  7. jimmbo

    Propeller recommendation: 14.5' Alumacraft w/Mercury 50HP 2stroke

    I think the Tach is reading a bit High. In 50 yrs I have Never seen a 14" prop on the 44. inch 50hp, on a 14-15 boat, turning 5700 rpm. I have seen them turn around 4700-4800rpm
  8. jimmbo

    1993 Evinrude 70hp Missing Prop, Seeking Recommendations

    I agree with Racer, a 17" would be a pretty much what would be on a 70hp on a boat in the 16' range. I also think 1900lbs is a bit Heavy for that Hull.
  9. jimmbo

    Throttle cable adjustment 72 Merc 500

    How long have you owned this Motor and Controls?
  10. jimmbo

    Throttle cable adjustment 72 Merc 500

    If you have the Linkages all adjusted correctly(known as a Link and Sync). you should have enough adjustment space on the Cable to set the Length.
  11. jimmbo

    Prop size for a 1970 evinrude 40hp electric shift

    We used to use a 12" on our 14ft Skagit(glass), an 11" or 12" would be in the Ballpark What Oil are you using in the Gear Case?
  12. jimmbo

    Fuel and or oil or mix leaking

    When do you see the collection at the Base of the Powerhead? When it is tilted up, or when the motor fully down?
  13. jimmbo

    Waterski prop advice

    Welcome to iboats What is the WOT Rpm Range for your engine, and what are you attaining with the current Prop? I actually prefer the merc Black Max Aluminum Props over the High Five. A 4 Blade with a lot of Blade Area, should be able to provide more than enough 'Yank' to pull the Tow Handle from...
  14. jimmbo

    Wide open throttle timing

    Besides posting this in the wrong Forum(I sent a note to the Moderators to move it), You have not provided any Info as to what Engine is involved. What Service Manual are you using to guide you thus far?
  15. jimmbo

    Johnson stops dead!

    No, those engines were design to last over 1000 hrs at WOT. Back in those days, if you tried that with an Automotive/Truck Engine, it wouldn't make it 300hrs.
  16. jimmbo

    Johnson stops dead!

    Try running it with the Gas Cap on the Tank, loose
  17. jimmbo

    Need a CDI for a 1979 to 1983 120HP mercury outboard

    I too have Never heard of a 120 Hp Mercury Outboard from that, or any other Era
  18. jimmbo

    AMS Oil 75W90 or Evinrude Lower Unit Gear Oil

    As mentioned a Marine Grade Gear Oil will be fine, as the unit is not a Hypoid Gear design.
  19. jimmbo

    Evinrude 10HP 1964 motor needs skeg repair or replacement.

    Hey Racer, you coming out to Burnstick Lake this Year?
  20. jimmbo

    Evinrude 10HP 1964 motor needs skeg repair or replacement.

    One of my OMC Prop Charts shows a 10HP in 51, using the same Prop #s as the 56-63s
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