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  1. jimmbo

    New prop for my boat

    In one sentence he is saying the Dealer told him the Rev Limiter Kicks in at 5800. Then a couple of post later, he is saying the WOT Range is 5500 - 6000. BTW if the WOT is 5500 - 6000, 5800 is not Overpropped, in any way, shape, or form. 5300 would be.
  2. jimmbo

    What oil to use??

    A Problem though, is at the time of Introduction, 25 yrs ago, there were no Oils specific for the DI Engines, and both OMC and Mercury were saying to use TCW-3. As it is well known, the TCW-3 Spec was quite old back in 1998, and all TCW-3 Oils were not the same. There were Rumours about a TCW-4...
  3. jimmbo

    New prop for my boat

    If the Engine was Severely Underpropped, and Rev Limiter was kicking in, there will be gains as higher Pitches are utilized. How much? I won't commit to any Numbers, but we know that those higher Pitches will certainly reduce the Holeshot. Engine Mounting Height on a Pontoon, is more like Voodoo...
  4. jimmbo

    Johnson vs Merc

    Pretty much every OMC Crossflow V4 will break a Piston Ring. There is an Unwritten Law that says they Must, regardless of how it was or wasn't Maintained
  5. jimmbo

    What oil to use??

    You bought Oil that had "Optimax" on the Label? Was the Bottle Sealed? Where did you buy it? Check with the Dealer as to what Colour the Optimax Oil is. Yea a lot of 2 stroke Oils are dyed Blue to help verify that Oil is mixed in the Gas, but with DI Engines(Optimax is one) there is no need to...
  6. jimmbo

    New prop for my boat

    Pictures, taken from the side, Level, not pointing Up or Down, taken of the Relationship between the Prop and Hull Bottom.
  7. jimmbo

    Out on the Lake Pictures

    In a Week, the daylight hours will be reducing again.
  8. jimmbo

    Does this seem right to you?

    It is badly Worn/Damaged. It is not difficult to replace, just make sure to get one that matchs the type of Brakes the Trailer has, Disk vs. Drum.
  9. jimmbo

    1983 Merc 50hp is chugging after a minute of running.

    There are 2 carbs on that engine, each feeding 2 Cylinders. If one isn't feeding gas, the engine will slow down and won't be running smooth, but that would actually be a very Minor Concern. The Oil needed to Lube Engine is mixed with the Gas, so no Fuel means no Oil... What do the Plugs look...
  10. jimmbo

    Unknown year

    That colour of Decal was first used in 1986, and ran for a few yrs. There should be a metal Disk on the Powerhead, looks a bit like a Frost Plug. It should have the Serial # on it too.
  11. jimmbo

    New prop for my boat

    In one post you say the Rev limiter is 5800 then you say the WOT range is 5500 - 6000 So which is it?
  12. jimmbo

    90HP Mercury pushing 24' pontoon

    Let me rephrase that. Change 'Oil Company Executives' to 'Petroleum Robber Barons' I love a Healthy Percentage of Socialism. Many things, like Energy, Communications, Healthcare are far too Important to be left in the hands of Capitalists. I would like a to see a 50-50 split, that way each side...
  13. jimmbo

    90HP Mercury pushing 24' pontoon

    First time I remember ever seeing someone wanting increase Fuel Consumption... Other than Oil Company Executives
  14. jimmbo

    New prop for my boat

    So what it the WOT Rpm Range for your motor? 5000-5500, 4500-5500? Try the 12, will bring the Rpms down, if it doesn't an you are still hitting 5800, you have to add more Pitch. As for the 3000lb vs, your 2300lb. I will assume the 3000lb was referring to non-pontoon boats. What works on...
  15. jimmbo

    Johnson Outboard 9.5 1973 9R73B can hardly pull start with spark plugs in but with plugs removed pulls very easy

    50:1 became the norm in 1964, the first yr of the 9.5 , his is a 73, the last yr for the 9.5
  16. jimmbo

    1976 Evinrude 55HP - Charging issue

    That is 17 volts, hooked up to a Battery? What was giving the Over Volt Warning?
  17. jimmbo

    New prop for my boat

    He says max is 6000rpm, and he is only at 5800... I have no idea what the Rev Range is on these 4 Strokes, so I hope he was accurate
  18. jimmbo

    Fuel tank capacity

    He could pump tank empty(might remove any water as well) while on the trailer, then head to the Gasoline Robber Baron Station. Beats running out of Fuel on the water.
  19. jimmbo

    Merc 650 prop shaft seals

    1971 was the last year for the 4 cylinder 65hp. It shares the Gearcase used by the 4 Cylinder 80 and 85hp, and used the same Gear Ratio of 2.3:1. A Case for the Inline 6s would fit, but they usually had a 2:1 ratio, though some were 1.78:1(1972 115)
  20. jimmbo

    Fastwin 18 - Help IDing Part

    The Choke can also be used to Stop the Engine. In fact that was how Evinrude said to do it in the late 50s
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