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  1. 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...
  2. jimmbo

    Evinrude 35hp Lark Solenoid won't kick

    The Only Years for a 35hp Lark, were 1957, 58, and 59
  3. 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?
  4. jimmbo

    Need to vent....

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

    Tilt and Trim 150hp Mercury v6

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

    1990 Trophy twin Force 120s prop question

    You need the WOT Rpm to determine if the Prop is Suitable...
  7. 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...
  8. 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
  9. jimmbo

    Prop question

    First of All, what is the WOT Rpm Range for your Engine? What condition is it in Mechanically?
  10. 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...
  11. 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"?
  12. 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...
  13. jimmbo

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

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

    Sacrificial Aluminum Prop

    The Flex is probably even Less than 1/100", Where do you get your BS? Advertising/Marketing/Social Media?
  15. 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
  16. jimmbo

    Telltale on lower unit?

    Normal. Those Engines discharge water from several Locations
  17. jimmbo

    Sacrificial Aluminum Prop

    As I said, At speeds over a 100mph, the Flex would be approx 1/100". Water will move long before a Blade will Flex. But as I said many have fallen for that, basic Lie, and rushed out for a SS. SS Props are more Efficient because of thinner Blades, and the higher strength of SS will permit...
  18. jimmbo

    Sacrificial Aluminum Prop

    Deleted
  19. jimmbo

    Sacrificial Aluminum Prop

    Yes, I am. There is some Misconception that these Blades are so weak/flimsy they flop around like the Blade is on a Pivot. While there may be a bit of Flex at Extreme Speeds(well past 100mph), it is still gonna be a very tiny fraction of an Inch. But it has been a Wonderful Marketing Sham to...
  20. jimmbo

    Sacrificial Aluminum Prop

    40mph Speed Limit for a Prop? That is a New One Reading the Chart, shows approx what Top Speed would be if the Engine was at top rpm, and that was taken into account for the Load If you use a Prop that is too low in pitch for the Load, the Top Speed you will get will be higher simply because the...
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