Recent content by jimmbo

  1. jimmbo

    Replaced carbs in four stroke outboard - now hear popping

    On a 2 stroke, it was easy, as the Carbs had to be fully closed at Idle, and the Linkages between them could be set. Do you have the Factory Service Manual for that Engine? If not, get one
  2. jimmbo

    Prop Help

    Looking at the pic, it looks like a 15"(short) shaft motor
  3. jimmbo

    Prop Help

    What is the WOT Rpm range for your Motor? My Guess is 5000 - 5500. If so, you are over revving at 6000 - 6100 and will need about 3 inches more Pitch, so a 17 will be in the Ballpark
  4. jimmbo

    carburetor swap

    While it will bolt on, I wouldn't recommend it
  5. jimmbo

    Need better hole shot

    The Gear Ratio should be on the Drive, on the 3/4 Band on the upper gear houseing
  6. jimmbo

    Need better hole shot

    A loaded 21 ft, is not going to be a Ball of Fire, with any engine less than a Big Block. Torque is what you need, not more high Rpm HP. In fact, increasing the top end HP, of any given Displacement, often results in poorer Holeshot I have an 18.5 ft with a 5.7, it has decent but not...
  7. jimmbo

    Wont go past 2500 rpm

    Did you actually check to see if there is an Ignition Problem, or are just going to throw Parts at it? Higher Revs in Reverse, could be due to less load on the Engine, due to the Prop operating in the Exhaust Gases A Compression Test should be done How long have you owned this Boat? When did...
  8. jimmbo

    Replaced carbs in four stroke outboard - now hear popping

    Are all the Throttle Shafts in Sync, as in All are exactly at the Same Degree of Opening, or fully Closed at the same time? 2 Strokes were some much easier to work on.
  9. jimmbo

    1978 Johnson 85ML78C

    A Wire Wheel? That is a great way to ruin a Plug, it can leave metal from the Wheel imbedded on the Insulator. Sand Blasting is the best way to Clean Plugs, though the Electrode takes a Beating and will need to be filed to provide a Sharp Edge, and the Gap adjusted
  10. jimmbo

    1975 Johnson 115 v4 won’t idle

    Take a small Blade Screw Driver, place the tip along each Ring, and see if it has any Spring to it. Oh, you already put the Covers back on. And yes to the Welsh Plug Question, a lot of Gum and Varnish can be under them and all the Carb Cleaner in the world won't dissolve it. However before...
  11. jimmbo

    carburetor swap

    While it was possible to turn a 22 inch 18/20 into a 25, it was more than a Carb Swap. Intake Manifold was different, so were the Pistons, Cylinder Head, Crankshaft, and Throttle Cam on the Armature Plate. The Pistons had the Pin in a Location closer to the Crown, this changed the Port Timing...
  12. jimmbo

    1983 evinrude 115 mystery hose

    deleted
  13. jimmbo

    Prop Recommendation: '85 Merc 50hp 2-stroke - 16' Alumacraft

    Can the Spark jump a 3/8" gap, on all Cylinders? Get the proper Factory Service Manual for that Motor Timing and Pickup Timing don't go out of adjustment, unless someone has fiddled with it Important that both carbs are feeding fuel, as the Oil is mixed with the Gas, no Gas, means NO Oil. If it...
  14. jimmbo

    How to prime fuel after winter / fogging

    What is "Easy Access", over the Gunnel or Transom?
  15. jimmbo

    Oil dripping from front water outlet at the top of lower unit.

    What does the Residue smell like, Gas-Oil or Gear Oil? Gear Oil stinks to High Heaven, and you will need to Bleach your hands to get rid of the Stench
See more
Top