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  1. jimmbo

    Might this work as a backup?

    Let the Prop Engineers worry about Diameter. However, you do need to know the WOT Range for your engine, and chose a Prop that allows it to run within that Rpm range at WOT, preferably in the upper half. That said, there will be many props with identical/similar Diameter and Pitches, yet will...
  2. jimmbo

    Broken Skeg

    Are there any Prop Rebuilders nearby. They often do a booming Skeg Repair Business in addition to Prop Repair...
  3. jimmbo

    High compression in 1 cylinder - 7.4 carb

    Yup
  4. jimmbo

    Outboard in the Lake

    Points and Condensers are under the Flywheel
  5. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    If it is the Neutral interlock, you can bypass it, but then you have manually insure the motor is in Neutral, and not in gear at Full Throttle, when you go to start it.
  6. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    As racer said, Neutral Safety Switch(es) could be the Culprit, You might need to take the Control Box apart.
  7. jimmbo

    High compression in 1 cylinder - 7.4 carb

    Pull the Lifter out and examine it. 999 out of a Thousand you can determine if the a Cam Lobe is wiped just by looking the Lifter. . If the Lifter is collapsed, I would try taking it apart, freeing it up, cleaning it and reassembling it and putting it back, as putting a new Lifter onto a used...
  8. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    So you are saying when the Key is turned to Start, voltage is arriving at the Solenoid, and that jumping from the Battery Cable to the Same terminal that the wire you got current on when wifey, turned the key, results in No Cranking? Check to see if the other small wire on the Solenoid is Grounded
  9. jimmbo

    Outboard in the Lake

    That damn Oxygen sure makes a Mess of Crankshafts after they get wet
  10. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    Jumping the Connections shown by the Green U, would test the Solenoid. While checking for Voltage at the wire going to the Terminal pointed to by blue arrow, while turning the Key to Start, will verify the Key Switch and Wiring Edit: BTW, I know this Diagram isn't your Engine, but the Starting...
  11. jimmbo

    High compression in 1 cylinder - 7.4 carb

    I thought it was odd that it doesn't have the usual Adjustable Rocker Nuts, but I supposed GM/Mercury made the change for a Reason. I used to consider adjusting the Valvetrain a relaxing task on a Hot day. I wasn't impressed with my Olds/Buick Engines.
  12. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    Possibly. Or it means you have 2 bad Solenoids. That is why a Disciplined Troubleshooting Method is needed. Some People love to switch parts until the problem goes away. I hate spending Money and/or Time doing unneeded work. Do you have a Voltmeter? If so, you can easily check to see if Voltage...
  13. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    next would be a test to see if the Soleniod is good/bad. Jump across the Battery Cable at the Soleniod, to the small terminal next to the Battery Cable. If the engine cranks, then the problem is in the Wiring to the Control, or the Key Switch
  14. jimmbo

    Outboard in the Lake

    Spray copious amounts of WD-40/Powertune into the carb as starter is being pulled. Both are pretty good at mixing with and flushing out water. If no spark, disconnect any stop button, and try again. If need be, remove the Flywheel and dry out the Ignition System. A 73 would have the Universal...
  15. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    I used to use Pliers. It will likely create Sparks, which can be a Fire Risk. A set of Booster Cables, one each side of the Solenoid, can move the closing of the connection away
  16. jimmbo

    73 50 hp johnson quit, now nothing. Help please

    What happens if you bypass the Solenoid? Could be a bad Key Switch,
  17. jimmbo

    Wrecked boat, repaired now problems with rpm.

    Being that 'V8' covers a variety of Engines, it is entirely likely you ended up with a Different Ratio. Your engine likely has a WOT range of 3800 - 4200 rpm, so you are a little high in pitch, but as mentioned it might a bit harder to find a Prop low enough in Pitch, and props less than 17"...
  18. jimmbo

    High compression in 1 cylinder - 7.4 carb

    Collapsed Lifter, could also be a bent Push Rod. Remove the Rocker Arm and exam the Pivot point, and check the Push Rod for Straightness. Next step would be to remove the Intake, and pull the Lifter to check it out.
  19. jimmbo

    Prop Locking Question (Reverse Locking Cam?)

    When you say "Unpack the LU", are you referring to dropping it, or taking it apart? The Shift Shaft, is in front of the Exhaust housing, and actually comes down the Yoke(Steering Swivel). Red Arrow is pointing to the Bolt that holds the Trim Tab, which covers another bolt that needs to be...
  20. jimmbo

    Prop Locking Question (Reverse Locking Cam?)

    #48 is connected to a 2 piece Shift shaft that goes up to the Lower Engine Cowl. It does split in two, where the Gear Case separates from the Exhaust Housing/Midsection. If the two had been Separated, and weren't reconnected, or misaligned when the the Gear Case was reinstalled, all the fiddling...
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