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  1. jimmbo

    Prop questions on a 16' 1976 StarCraft Montego (Merc 888)

    351 Heads on a 302 actually raising Compression sounds like a long shot, the Combustion Chamber is Larger and will drop the Compression from 8:1 to less than 7:1, unless some Machining and/or Parts changes also happened. As for the Cam, is it a Marine Grind, or some Street Auto/Truck Grind?
  2. jimmbo

    I am starting to believe some of the global warming in N J.

    Mother Nature is just reminding Man that He really doesn't own the Planet, that It was here before He came along, and will still be here long after He is gone
  3. jimmbo

    WATER JACKET/HEAD GASKET 1987 25 HP 2 STROKE MERCURY

    The Water Jacket Covers on a lot of Mercurys will leak around the Spark Plugs, and yes it can happen because the Engine was starved of water, and the Cover would distort, and the Gasket would shift/tear. Happened a Few Times on my inline 6, After the 3 time, the Dealer GAVE me a New Jacket...
  4. jimmbo

    I am starting to believe some of the global warming in N J.

    Hit 100F in Edmonton Alberta the last couple of Days, and it is about 320 miles North of the 49th Parallel At 1:40 AM is it is still 79F I almost miss the -40F we had for a Week in January
  5. jimmbo

    Prop questions on a 16' 1976 StarCraft Montego (Merc 888)

    A 302 spinning 5000 rpm isn't going to Need more than 370 CFM@1.4" Pressure Drop. The Marine Holley, if Factory Calibrated properly, will certainly have a Fuel Delivery Curve far more Appropriate for a Marine Application, than an Auto/Truck Carb, and be USCG Compliant, reducing the Chance of the...
  6. jimmbo

    Evinrude 35hp Lark Solenoid won't kick

    The Only Years for a 35hp Lark, were 1957, 58, and 59
  7. jimmbo

    Prop questions on a 16' 1976 StarCraft Montego (Merc 888)

    "Hopped Up", 188hp, to 200hp would be about 2 mph more top speed, and likely a slightly slower Holeshot. What exactly was done to Hop it up?
  8. jimmbo

    Need to vent....

    BMW, is the Acronym for 'Bring My Wallet'...
  9. jimmbo

    Tilt and Trim 150hp Mercury v6

    Reread my last Sentence, regarding the Filler Cap.
  10. jimmbo

    1990 Trophy twin Force 120s prop question

    You need the WOT Rpm to determine if the Prop is Suitable...
  11. jimmbo

    Prop question

    Probably by a 1 or 2 hundred Rpm, more if Air gets in the the Prop. You boat is a Tin Boat, with no Rivets on the Bottom of the Hull? Is there a Keel Extending all the Way back to the Transom? If not, you should be able to Raise the Motor until the Anti-Ventilation Plate is Even with the Bottom...
  12. jimmbo

    1990 Trophy twin Force 120s prop question

    First of all what is the WOT Rpm Range for that Engine? In the 70s Merc ran them at a lower Speed than later engines, My guess is around the 3800- 4200 rpm
  13. jimmbo

    Prop question

    First of All, what is the WOT Rpm Range for your Engine? What condition is it in Mechanically?
  14. jimmbo

    Tilt and Trim 150hp Mercury v6

    What you are calling a Pressure Relief Valve is like the Manual Release Valve, to be used to Raise the Motor in case of Trim System Failure. Yes it can be used to lower the motor. But I recall, that it would only go down to the Highest Trim Setting. Maybe it would drop lower if Prop Thrust was...
  15. jimmbo

    Tilt and Trim 150hp Mercury v6

    If the Manual Release Valve is Open, the Motor will drop down. What do You mean, "I think I let the motor come down to fast"?
  16. jimmbo

    Tilt and Trim 150hp Mercury v6

    If the Fluid is coming out of the housing, then the Housing is damaged, or the O-ring is bad. If the Fill Screw is not in Place, Fluid will spray out of it if the Pump is operated. I had an inline with the same Trim System, and I don't recall there being a Bleed Screw on it. Bleeding the Air out...
  17. jimmbo

    '85 50HP 2-Stroke - runs poor with wrap-around cowl on

    A bit of EGR happening there...
  18. jimmbo

    Sacrificial Aluminum Prop

    The Flex is probably even Less than 1/100", Where do you get your BS? Advertising/Marketing/Social Media?
  19. jimmbo

    What performance can be expected from this prop change?

    Being that the Props are not likely the same Brand or Model, and different Diameter, not to mention Rake and/or Cupping, it is not an Apples to Apples Equation. A 3/4" change in Diameter, leads me to think that 22 is not a Prop for the Mercrusier
  20. jimmbo

    Telltale on lower unit?

    Normal. Those Engines discharge water from several Locations
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