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  1. jimmbo

    Military Outboard OMC 35hp

    A lot of Miltary engines were expected to be used after even prolonged submersion, many were equipped with Check Valves in the Exhaust that closed when the engine was upside down on it Cowl, they also had Quick Drain Systems for evacuation the Carb and Crackcase of water. Finding Service...
  2. jimmbo

    The wait is over. Sharrow prop test.

    Hmmmm Oil Thread
  3. jimmbo

    Should I replace all 3 pistons?

    2 Stroke Cylinders wear a bit differently than 4 stroke, the Taper does occur, but the Area around the Ports also wears more too
  4. jimmbo

    Rooster Tails

    I overtrimmed my 115 merc and got one, also warped the cylinder head waterjacket cover. My I/O has done it,it's not over trimmed. Service manager drove,
  5. jimmbo

    1973 mercury 1500 charging issues

    Have you tried using an Analog Voltmeter? The DC coming out of the Rectifier is not of a Steady Voltage as it is basically a chopped or folded Sine Wave(depending on how many Diodes are in the Rectifier Assembly), no longer alternating from Positive to Negative volts of equal Value, but is now...
  6. jimmbo

    3 cyl 65hp Merc - teach me a few things...

    They look like this Harnesses are available from 3rd Party Suppliers.
  7. jimmbo

    Big twin flywheel compatibility

    I was referring to a Timing Fixture that is installed on the End of the crank shaft after the Flywheel is removed
  8. jimmbo

    accelerator pump for 1993 4.3 volvo penta accelerator pump'

  9. jimmbo

    Big twin flywheel compatibility

    The 1958 35 hp Owners Manual said to adjust the points to 0.020" thru the hole in the flywheel. Granted using the Timing Fixture and the timing Marks did set the exact spot when the points opened
  10. jimmbo

    My Collection is Growing

    Triplets
  11. jimmbo

    Merc 5.7L TKS Carb replacement with non TKS help

    The AFB carbs do have both bolt patterns, but they are not spread bore carbs by any stretch of the Imagination and the Primaries are larger than those used on the Q-jet or Cater's own Thermoquad and will not fit on Most GM Spreadbore Manifolds Here is a pic(from Dennis Moores book SB Chevy...
  12. jimmbo

    1990 Evinrude 20 HP convert to 25 HP (Model # E20CRESB)

    Looks like someone has been messing with the linkage and had no idea what they were adjusting. In the second pic, there are signs the collar has been moved. Loosen that set screw so the rod is free to move, and ignore it for now. The roller should just start to make contact with the cam, when it...
  13. jimmbo

    Evinrude 80 Hp Starflite VIII

    Some specs on the 1966 80 HP 89.5 cubic inches 3 3/8" X 2 1/2" Bore and Stroke 80 HP @ 4500 rpm WOT range 4000 - 5000 rpm Battery Ignition system 2 bbl downdraft carb with Fixed Hi-Speed Jets, adjustable Low Speed Needles, Auto choke Recirculating Temperature controlled Cooling System with...
  14. jimmbo

    Johnson Motor identification help needed

    That looks like a 28 hp cylinder head, a 33 hp head would look a lot different From the 1963 brochure, some info
  15. jimmbo

    90hp vs 115hp

    In 1984, I replaced a crank rated(1978) 90 hp Mercury, with a prop rated(1984) 115 mercury. The boat went from 38mph, to 49mph. If it had been a crankshaft rated to crankshaft rated motor, or a prop shaft rated to prop shaft motor, the increase would have been about 5 mph
  16. jimmbo

    1990 Evinrude 20 HP convert to 25 HP (Model # E20CRESB)

    A lot of work/hassle to maybe gain 1 - 3 mph We had a 79 25, and an 80 35, on the same hull. there was only 2 - 3 mph difference, the 25 did idle down a bit better and was less jumpy at off idle. Granted those years they had different midsections and gearcases.
  17. jimmbo

    2 bunks vs 4 bunks

    Here's how mine are spaced. Boat's not perfectly centered, but it has never been an issue. Sometimes I get a bit better, other times it is off on the other direction. As for tippyness, it sits rock solid and stable. This year, I have had it 17 years. It has a 5.7 V8 in there Without the...
  18. jimmbo

    2 bunks vs 4 bunks

    It is easier to set up a 2 bunk trailer than a 4 bunk, but some dealers can still bungle it. However it does look like the bunks on your trailer are way too far apart. Moving them closer together will help the self centering Take it back to the Dealer and tell them to set it up better. I really...
  19. jimmbo

    What effect does motor height have on attitude (bow lift, porpoising, etc)?

    Here are Mercury's recommendations. The only time they recommend putting the AV Plate below the hull, is on Heavy barges. Other Outboard makers have similar Philosophies
  20. jimmbo

    1987 Johnson 90 - Block Rebuild Upgrade?

    It is possible to turn a 99.6 cubic inch 90 into a 110, 112, 115 or even a 140. a bit of machining, and some parts and it is a done deal. It is also possible to get more than 160 hp out of that Block, with some serious machining and modifications.However it will not be a very good Recreational...
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