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  1. jimmbo

    Fiberglassics site down or gone?

    It is up and running again
  2. jimmbo

    115 Evinrude Starflite Ignition question

    Myself, I would back it off 4 degrees, see how it runs, and then readvance the timing in 1 degree intervals, listening carefully for Preignition/Detonation
  3. jimmbo

    115 Evinrude Starflite Ignition question

    Going to a Regular Plug from a Surface gap, places the Spark deeper into the Combustion Chamber, effectively advancing the timing, so the engine will idle a little faster. How it affects the Flame Front at higher Speeds I don't know
  4. jimmbo

    1988 mariner 75 one cylinder not working

    Ether, just about Guaranteed to wreck a 2 Stroke
  5. jimmbo

    2 Stroke Exhaust...

    That would have been a 1960 or 61 Dockbuster. Horrible/Dangerous design that made it into Production and then the Sales Floor.
  6. jimmbo

    Mercruiser 5.7 won’t make power

    Given a choice of a 300hp SB, and a 300hp BB, I will always choose the bigger engine, just for the extra Torque at low rpm.
  7. jimmbo

    Honda '85 B100L submerged

    A real Shame, a couple of hours time to drain the water out and then run it, the engine would have been fine.
  8. jimmbo

    1968 Johnson Tr-10r 55hp wiring help

    When did OMC drop the Ammeter? I remember our 1963 40 Electramatic having one, it certainly revealed when the Generator failed. Our 1965 90 Starflight also had one and it was pinned on "+20" whenever the Motor was above 1800rpm.
  9. jimmbo

    Honda '85 B100L submerged

    It is amazing how many times 'Minor Details' aren't mentioned initially
  10. jimmbo

    Starting problems.

    Replacing the factory Holley 500CFM(378CFM when flow rated like a 4bbl) 2bbl with the 4bbl, gave me another 500 rpm, which required a higher pitch prop to bring the RPMs down, which loads the engine higher, and reduces Hole Shot. The tiny Primaries help a tiny bit at preserving the bottom end...
  11. jimmbo

    compatibility

    Or a messed up carb-timing sync
  12. jimmbo

    Starting problems.

    Most Q-Jets were capable of flowing 750 CFM, at a 1.5" pressure Drop. However I doubt you engine needs more than just over 525 CFM @5000 RPM. I am giving the Engine a VE of 80%, which I think is Generous Holley does market a 4175 650CFM Spreadbore Part #80402 for Marine use Here is mine
  13. jimmbo

    compatibility

    Same goes for todays cars. You have to pull the engine to replace a Thermostat, or Heater Fan
  14. jimmbo

    1995 Mercury 115hp. Wot bog

    The carbs shouldn't go past Wide Open, but not knowing the History of the Motor, I would recommend checking to see if the Carbs aren't going past Wide Open, and are closing again. As I said, they shouldn't but
  15. jimmbo

    1988 mariner 75 one cylinder not working

    Pull the flywheel and see if there is oil around the area of the Upper Crankshaft Seal. If oil is getting out, air is getting in and out as well.
  16. jimmbo

    Mercruiser 5.7 won’t make power

    I have always found the Prop Calculators a bit optimistic on the amount of Pitch chosen. Then again, I do my boating between 1950 and 2400 ft above Sea Level.
  17. jimmbo

    Mercruiser 5.7 won’t make power

    Adding Diameter, while subtracting Pitch can result in the engine seeing the same overall Load, and thereby no change in RPM. A 2" increase in Diameter is substantial
  18. jimmbo

    Tach non working on Mercury classic 50

    I saw a Wiring Diagram from Mercury and it showed the Rectifier as having 2 Diodes, not 4.
  19. jimmbo

    2 Stroke Exhaust...

    Which is higher Viscosity than Modern Oils, which start out at about SAE 20 and have thinners added.
  20. jimmbo

    Tach non working on Mercury classic 50

    Mercury is not using Full Bridge Rectification, just Half Bridge. Might be a way to keep the Current low enough to avoid a Regulator
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