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  1. jimmbo

    I need help with a 58 super thunderbolt iekhaefer!

    Often the Neutral Interlocks are in the Control Box. Remove the Plug wires and ground them,
  2. jimmbo

    Evinrude 25 Electric Conversion

    In 1977, the 25hp was a 22 cubic in. block, in 78 it switched to a 32 in. block. As F R said very different.
  3. jimmbo

    Accurate Horsepower Figures

    The Venturi is larger, as the carb has a higher Air Flow. A 5.7 needs a bigger Carb than a 5 liter. Rejetting is not going to make it a bigger carb
  4. jimmbo

    I need help with a 58 super thunderbolt iekhaefer!

    The one I was handling at the Parts Counter was.
  5. jimmbo

    I need help with a 58 super thunderbolt iekhaefer!

    Weak Magnets in the Magneto, bad Condenser, Something grounding out. I hope it is not the Rotor. If memory serves me right, it is part of the Distributor Shaft, and no longer in Production, though some Dealers might have NOS, on their shelves. Any Corrosion should be removed,
  6. jimmbo

    I need help with a 58 super thunderbolt iekhaefer!

    It can.
  7. jimmbo

    I need help with a 58 super thunderbolt iekhaefer!

    There is a bit of Friction in the Propshaft Bushings so sometimes the Prop will rotate a bit when running in Neutral. When in the water the water provides a bit more Resistance, Now you are going to drop the Lower Unit and replace the Water Pump Impeller as you did Damage to it, running like you...
  8. jimmbo

    Merc 650 prop shaft seals

    Before you install it, replace the Water Pump Impeller. If it has been sitting 45+ yrs, I wouldn't trust it.
  9. jimmbo

    Quadrajet Secondaries Problem

    While the Secondaries on the Q-jet are Mechanical, they are connected to the Throttle thru a spring loaded Linkage. That is because there is a Lock-out that will lock the Secondaries closed when the Choke is not fully open. It is possible that that is why there is no Secondary action
  10. jimmbo

    Merc 650 prop shaft seals

    Easiest and likely least costly, is to find a Lower Unit, from a 4 cylinder 75, 80, 85hp. The 79 and later have slightly more Hydrodynamic shape.
  11. jimmbo

    New prop & hub yet I still have minimal speed

    The Anti-Ventilation Plate should be Even with the Bottom of the Boat
  12. jimmbo

    New prop & hub yet I still have minimal speed

    Even that in photo, it looks like the motor is too long for the Boat. Take Picture, Level(not tilted up or down), at the height of the Bottom of the Boat
  13. jimmbo

    New prop & hub yet I still have minimal speed

    Take the old Thrust Washer off, and put the one that came with the Hub Kit on in its place. With both Washers on, the Prop is too far back, and not all the exhaust Gases are going thru the Hub of the Prop, some are getting out and causing the Prop to Ventilate(slip) Turning Point should have a...
  14. jimmbo

    New prop & hub yet I still have minimal speed

    Not my favorite brand of Prop, but they are Inexpensive. Did you get the correct Hub Kit for it?
  15. jimmbo

    New prop & hub yet I still have minimal speed

    Break Away Pin? Are you referring to a Drive/Shear Pin? Your engine doesn't use that, it has a Splined Shaft and Hub Insert. Disk? Are you referring to the Thrust Washer that goes on the Propshaft and the Prop against it? If either are Missing, or the wrong ones, various things can happen, and...
  16. jimmbo

    Merc 650 prop shaft seals

    What is the Height of your Transom, 20" or 15"? The 4 cylinder 65hp used a 2.3:1 gear ratio, most of the inline 6s used 2:1, but some, the 1972 115, showed a 1.78:1 in the Brochure. Count the teeth on the gears and you certainly will be able to figure the Gear Ratio. Here is another Curve, when...
  17. jimmbo

    a carburetor shouldn't spill fuel like this, right?

    Deleted
  18. jimmbo

    1981 Evinrude Issues

    Welcome to iboats It is amazing how many used motors start fine for the Seller, but not for the Buyer, once he gets it home... You have a few electrical issues that need to be fixed. Starter don't normally try to reengage the Flywheel once the engine start and the Key released. The...
  19. jimmbo

    Adjust all 3 carbs at once or seperate ?

    You have to adjust each individually, for best Idle, in gear. It will take several rounds. If one carb is a lot different than the other 2, then checks for Air Leaks, or High Fuel Level in the Carb. After you get that squared away, you can see how the engine responds to Throttle, again in gear...
  20. jimmbo

    Inherited new boat. Unsure what it is exactly

    That is what they looked like
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