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  1. jimmbo

    Almost Sunk… where do I start to salvage boat

    Boat get swamped all the time. A few fluid changes, and electrical drying and get er running ASAP(preferably within 24 hrs). Starter will need some TLC later, but get it running and running warm for at least an hour. Then another Oil Change
  2. jimmbo

    1977 302.

    And a hell of a lot more Torque, than a 4.3 could ever make
  3. jimmbo

    Carburetor Issues, Dripping Carbs...

    What kind of float is in it? Hollow, shake it to see if you can hear any liquid inside. Solid, apply pressure on it to see if any fuel squeezes out. Or just get a new Float. Also a new Needle and Seat, and Gasket for the Seat, and make sure it is tight.
  4. jimmbo

    Higher elevation issues.

    Have you considered placing a Straightedge on the Hull to check for a Rocker?
  5. jimmbo

    1991 20HP Evinrude no acceleration

    The Proper Pitch is one that allows the Engine to run within the Engine's WOT rpm range, usually preferred to be in the upper half. To determine that, a Tachometer is needed. What is the Proper Pitch for a 14ft Car Topper, is not going to be the Proper Pitch on a 20ft hull.
  6. jimmbo

    New to iboats hello..

    Once you rebuild and reinstall the Carb, you have to make sure the Synchronization between the Timing Advance and Carb are correct. These are from a 50 yr old 3rd party Service Manual, one of the better 3rd party manuals
  7. jimmbo

    WOT rpm range

    Mercury has been making some of the finest Props for many Decades. In the 50s, 60s, and 70s, they were Leap Years ahead of the Competition.
  8. jimmbo

    New to iboats hello..

    First thing you Must do before running it, is to drop the Lower Unit and replace the Water Pump Impeller
  9. jimmbo

    OMC and Johnson powerhead question

    They are both Loopers. However they are different HP so, that makes pairing them up iffy. A lot of Parts in/on the powerhead could be different. That includes the Block, Carbs, Induction System, Exhaust Tuning, to name a few. A very thorough look at the Parts Lists of both will need to be done
  10. jimmbo

    What is wrong with my alternator

    Have you checked the Electrolyte Level in the Batteries lately?
  11. jimmbo

    Up or down when trailering

    If the Engine can be Imobilized by either a Lock, or Hydraulics, then up is fine, if the engine can bounce around, then a Transom Saver can be used. If the motor is immobilized, and I mean immobilized, by Locks or Hydraulics, do not use what now becomes a Transom Breaker
  12. jimmbo

    WOT rpm range

    I have found that within a given Prop Line, the differences in Top Speed are less than 2 mph, unless the rpm is outside the WOT Range. Switching Prop Lines, and that includes Brand, you will be starting with a New Anchor point
  13. jimmbo

    WOT rpm range

    If the engine had a RPM range of 5500-6000, the Rev limiter is not going to kick at 6000, it will take a few hundred more rpms before it does its thing
  14. jimmbo

    WOT rpm range

    There are several theories. Some will prop as close to the upper end with a Light Load, others will prop closer to the Rpm where the engine is making peak HP. That can be difficult to find and it not always what the Spec says. Case in Point, for years OMC made a 90hp, a 115, and a 140, all...
  15. jimmbo

    Converting from vertical 2x4 to horizontal 2x6 bunks

    It has more than ample Bunk Area for 600-800lbs
  16. jimmbo

    Higher elevation issues.

    Make sure you are actually using the Anti-Ventilation Plate(often wrongly called Cavitation Plate) for your measurement
  17. jimmbo

    1998 Mercruiser 5.0 Intake manifold gasket mismatch issues

    Okay I see that once you explained it. I wonder if someone removed some metal off of the Intake at some point. You said the engine had been rebuilt before you bought it. If the rebuilder had removed a lot of Metal from the Heads, it would change how the Ports on the heads lined up with the ports...
  18. jimmbo

    2002 Mastercraft 5.7 harmonic balancer moving in and out

    That Crank was cracked for a while, likely dropped on the factory floor, and put back into Inventory by an Employee who didn't want to get yelled at.
  19. jimmbo

    Higher elevation issues.

    Here is what Merc released
  20. jimmbo

    1998 Mercruiser 5.0 Intake manifold gasket mismatch issues

    When you said gaps, I was lead to believe there was a port being exposed to Atmosphere or Crankcase. Different Intakes and Heads can have different sized Ports, so the Gaskets are generally made for the Biggest Ports used in Production Intakes, so with intakes/heads with smaller ports, there...
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