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  1. jimmbo

    Correcting gear ratio with prop size

    It will report the Speed over the bottom of the river, not the speed in regards to the water, if there any movement of the water. Hence in a current of 5mph, a GPS will report a 10 mph difference in the speed depending which way the boat is going
  2. jimmbo

    Vintage Mercury Cooling Issue

    Those Red Decals are pretty much the Best that Mercury ever ever used on their Motors
  3. jimmbo

    1984 Mercury Blackmax 150hp questions

    When you replaced the Water Pump, you did install the Key/Pin that ties the Impeller to the Driveshaft?
  4. jimmbo

    primer bulb not doing anything...

    OMC may have use the name Gamefisher, but the motors were not the same. OMC motors had a Choke, they also had the gearshift linkage where this so called Primer is located, the Fuel Line on the OMCs connected on the Port side, all of which are different on the Motor in the picture.
  5. jimmbo

    1972 Johnson 25 HP no spark

    Here is a Wiring diagram of the Electrical, not counting the Ignition side of it https://www.downloadservicemanuals.com/manuals/evinrude-johnson/wiring-diagrams/18-25_hp_starter_system_thru_1972.pdf
  6. jimmbo

    marine engine mystery

    Mine is a 260hp with 2bbl, about 290-300 with 4bbl
  7. jimmbo

    marine engine mystery

    350/5.7L and 225hp? That doesn't add up
  8. jimmbo

    Correcting gear ratio with prop size

    You gotta do what ya gotta do😉
  9. jimmbo

    Alpha drive for a V8 whats the ratio?

    It would have to be a very light hull to use a 1.5 on a 5 liter, otherwise props in the 14 - 17 inch pitch would be needed. The 1.5 ratio was more commonly used on the 5.7
  10. jimmbo

    Correcting gear ratio with prop size

    It will be going faster than what the GPS states when you are going against the current.
  11. jimmbo

    18 hp johnson

    Did you verify that the Pin/Key that links the Impeller to the Driveshaft was in place? Also the Grommet for the watertube in the pump housing needs to be there
  12. jimmbo

    primer bulb not doing anything...

    Is this even an OMC motor, it looks more like a Force?
  13. jimmbo

    primer bulb not doing anything...

    The carb is vented to the Atmosphere, so pressing on that bulb, any air from from it would be vented by the bowl vent.
  14. jimmbo

    primer bulb not doing anything...

    So for it to work that way, the Carb is vented thru this primer thing? A choke works so much better
  15. jimmbo

    Aftermarket carbs?

    What temp of stat did you order?
  16. jimmbo

    primer bulb not doing anything...

    Is the primer thing getting fuel to it.?
  17. jimmbo

    Aftermarket carbs?

    If the engine has trouble running at speeds below 1000 rpm, then you have some Troubleshooting in store for you. First thing is a Compression Test. Post the numbers Can the Spark jump a 3/8" Gap on all plug wires? Is the Timing set properly? Is the Choke unwinding fully, allowing the Fast Idle...
  18. jimmbo

    No forward until I unplug the wires from the solenoid?

    I gave my earlier comment, cause the link you gave showed a Johnson Control, and being that he would be dealing with an Evinrude Control, though electrically the same, they certainly have little Resemblance to each other
  19. jimmbo

    1984 J90 HP .060" over. Why not?

    If a Ring End is going to catch on a Port, a Chamfer is not going to make any difference.
  20. jimmbo

    Correcting gear ratio with prop size

    Only if runs are made in opposite directions over the Exact same Distance, as 5 mph current becomes a 10mph difference between the directions when using GPS
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