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  1. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    We agree that a 15" is too much. A 13 would likely place the motor near its Peak Power, an 11 would raise the Rpms but the Motor will be putting out less than the rated hp
  2. jimmbo

    Rebuilt Carburetor… Still No Idle!

    Idle speed is set by retarding/advancing the Timing, which, Lo and Behold is linked to the Idle Stop Screw via the Linkages,. All the Idle Stop Screw does is Limit how far the Timing can be retarded
  3. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    I have rarely seen any real rpm Differences between an AL and a SS Prop, provided they have the same Blade Shape, Area, Contour, Cupping and Rake. I think the 13 would get you to about 4800- 4900 rpm, an 11 would put you 5200 - 5400 range The 90 makes its best power, slightly below 5000 rpm...
  4. jimmbo

    Old Evinrude question, Can anyone help?

    I wonder if someone stuck a 66 or later propshaft in it, or an entire Unit. If so, maybe it is hanging up on the Detent
  5. jimmbo

    What Mercury Do I Have?

    You should have started your own thread instead of Hijacking this one Do that and I will tell you what yr your motor is
  6. jimmbo

    What Mercury Do I Have?

    With a Merc, you need to give the Serial # to the Parts Person at the Dealer. Same goes for ordering online, the serial # will get you to the Correct Parts List Mercury would often make changes to engines midway thru a Production Yr, so there could be several Parts Lists within a given Year.
  7. jimmbo

    Old Evinrude question, Can anyone help?

    See Post #58 Racer would know. Last time I had one apart was in July 1972, My dads motor
  8. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Larger Diameters are more Prone to Ventilation as the Blade Tips are higher up. Mercury's Prop Selector was saying 12 or 11 inch pitch, but it is trying to get the Rpms above 5000 A Mercury Black Max and hub Kit to put it on your Evinrude would be okay.
  9. jimmbo

    Old Evinrude question, Can anyone help?

    The difference between a Lark and a Big Twin, is Paint, a few shiny bits of Trim on the Cowl, and a Cover over the Choke, Mixture Knobs, and Cowl Latch The Clutch Dog on a 56 should just slide off, forward or backward. Does it slide back and forth on the Splines?
  10. jimmbo

    Old Evinrude question, Can anyone help?

    I believe the Snap Ring is being used a stop for the Trust Washer. If it that Washer moves, the Reverse Gear can move also, with not good results. If it the correct Thickness, I can't see why it won't work. Yours does have a Tapered Roller Bearing at the Front of the Propshaft?
  11. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Very hard, Engine is strained, and Melted Pistons can occur
  12. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    You will probably have to drop 4 inches to get close to where the Engine makes its best power. A bigger motor is what your boat really needs
  13. jimmbo

    1967 evinrude 80 hp need help.

    I know the I/Os with that case, had an option of a 14" pitch, something that didn't show up on the Outboard Lists. Our 90 on the Evinrude Sweet 16 did 4400 with the 11" prop, and 4800 with the 9 1/4"
  14. jimmbo

    1967 evinrude 80 hp need help.

    Top pic #s 23, 46, 50, 42 Lower pic #s 67 Sometimes the oil appears glittery, sometimes there are small bits of metal, sometimes not. Some analysis/inspection of the Linkage and of the Internals will reveal. I suspect the linkage was bent
  15. jimmbo

    1967 evinrude 80 hp need help.

    That is the prop we used to run on our old 90. It is a Small hub prop, instead of the larger hub props that were the other choices
  16. jimmbo

    1986 Mercury 25XD

    Welcome to iboats First things first. What are the Compression Numbers? Perhaps the Plug Wire is no Good? You can swap the Wires to see if the spark moves to the other Cylinder Is the Coil Cracked? You can swap the Coils to see if the No Spark moves to the other Cylinder. If not then you...
  17. jimmbo

    1967 evinrude 80 hp need help.

    Those Lower Units are not difficult to repair. And it gives you a chance to replace the Pump Impeller. I made the comment about 'Easing it into Gear', cause many People do that, thinking that there is some sort of Friction Plate in there. There isn't, just a couple of Teeth on the Clutch Dog...
  18. jimmbo

    1967 evinrude 80 hp need help.

    I hope neither of you were 'easing it into gear'. I would suspect worn Clutch Dog, and Gears. I noticed that you have a 10 X 9 1/4" Prop on it.
  19. jimmbo

    Need propeller suggestions

    First make sure the Engine is in good shape and is able to make its power, especially since that engine appears to be severely Overpropped. Oh, Great, Tachometer Ears
  20. jimmbo

    Re power - 2 cylinder vs 3 cylinder Johnson 50hp

    The 3 will have slightly more Torque over a wider Rpm Range, because it is easier to Tune the Exhaust on a 3 cylinder than on a 2. It will likely have slightly better Fuel Economy as well, also due to the Exhaust Tuning. Racer points out an Important difference regarding Longevity Having the...
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