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  1. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Anyone can make a Chart...
  2. jimmbo

    Rebuilt Carburetor… Still No Idle!

    Look who's talking...
  3. jimmbo

    1985 Mercury Tower of Power 115 high rpm miss

    I couldn't hear any miss. One thing you gotta do on engines of that Era, is disable the 'Back Drag' feature on the Carbs. It was a way of leaning out the Mix at part Throttle, in order to reduce Fuel Consumption. Problem is that the Gasolines of Today are already Chemically Leaned, and the...
  4. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    A prop for a 150 is never going to fit on a 90hp. The Diameter is too great, and the Hub is matched to the V6 Gearcase, which is Larger than the one on the 90
  5. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    I call BS on the "Aluminum deflects too much" If there is any Flex, and that's a big if, it is less than 1/100". That bit of Marketing Misinformation has sold millions of SS props
  6. jimmbo

    What is this part called on Force 125

    His mind is made up, facts will only confuse him
  7. jimmbo

    Converting old log style to new center style manifolds

    Has Mercrusier or Volvo used the 302 the past 30 yrs? If so, they might have a newer style Manifold. Of course everything downstream would need adaptation as well
  8. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    We agree that a 15" is too much. A 13 would likely place the motor near its Peak Power, an 11 would raise the Rpms but the Motor will be putting out less than the rated hp
  9. jimmbo

    Rebuilt Carburetor… Still No Idle!

    Idle speed is set by retarding/advancing the Timing, which, Lo and Behold is linked to the Idle Stop Screw via the Linkages,. All the Idle Stop Screw does is Limit how far the Timing can be retarded
  10. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    I have rarely seen any real rpm Differences between an AL and a SS Prop, provided they have the same Blade Shape, Area, Contour, Cupping and Rake. I think the 13 would get you to about 4800- 4900 rpm, an 11 would put you 5200 - 5400 range The 90 makes its best power, slightly below 5000 rpm...
  11. jimmbo

    Old Evinrude question, Can anyone help?

    I wonder if someone stuck a 66 or later propshaft in it, or an entire Unit. If so, maybe it is hanging up on the Detent
  12. jimmbo

    What Mercury Do I Have?

    You should have started your own thread instead of Hijacking this one Do that and I will tell you what yr your motor is
  13. jimmbo

    What Mercury Do I Have?

    With a Merc, you need to give the Serial # to the Parts Person at the Dealer. Same goes for ordering online, the serial # will get you to the Correct Parts List Mercury would often make changes to engines midway thru a Production Yr, so there could be several Parts Lists within a given Year.
  14. jimmbo

    Old Evinrude question, Can anyone help?

    See Post #58 Racer would know. Last time I had one apart was in July 1972, My dads motor
  15. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Larger Diameters are more Prone to Ventilation as the Blade Tips are higher up. Mercury's Prop Selector was saying 12 or 11 inch pitch, but it is trying to get the Rpms above 5000 A Mercury Black Max and hub Kit to put it on your Evinrude would be okay.
  16. jimmbo

    Old Evinrude question, Can anyone help?

    The difference between a Lark and a Big Twin, is Paint, a few shiny bits of Trim on the Cowl, and a Cover over the Choke, Mixture Knobs, and Cowl Latch The Clutch Dog on a 56 should just slide off, forward or backward. Does it slide back and forth on the Splines?
  17. jimmbo

    Old Evinrude question, Can anyone help?

    I believe the Snap Ring is being used a stop for the Trust Washer. If it that Washer moves, the Reverse Gear can move also, with not good results. If it the correct Thickness, I can't see why it won't work. Yours does have a Tapered Roller Bearing at the Front of the Propshaft?
  18. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Very hard, Engine is strained, and Melted Pistons can occur
  19. jimmbo

    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    You will probably have to drop 4 inches to get close to where the Engine makes its best power. A bigger motor is what your boat really needs
  20. jimmbo

    1967 evinrude 80 hp need help.

    I know the I/Os with that case, had an option of a 14" pitch, something that didn't show up on the Outboard Lists. Our 90 on the Evinrude Sweet 16 did 4400 with the 11" prop, and 4800 with the 9 1/4"
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