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  1. 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...
  2. 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.
  3. jimmbo

    Out on the Lake Pictures

    In a Week, the daylight hours will be reducing again.
  4. 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.
  5. 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...
  6. 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.
  7. 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?
  8. 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...
  9. jimmbo

    90HP Mercury pushing 24' pontoon

    First time I remember ever seeing someone wanting increase Fuel Consumption... Other than Oil Company Executives
  10. 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...
  11. 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
  12. jimmbo

    1976 Evinrude 55HP - Charging issue

    That is 17 volts, hooked up to a Battery? What was giving the Over Volt Warning?
  13. 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
  14. 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.
  15. 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)
  16. 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
  17. jimmbo

    Johnson vs Merc

    Not a tri hull, 15 ft, rated for 90hp. Purchased from dealer as is in 82
  18. jimmbo

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

    Flywheel. I doubt that it is snagging on a Coil, as you are able to rotate the Engine with the Plugs out. No need to drop the Gearcase to check for water, just loosen the Drain Screw, and if water comes out, or the Oil looks like Irish Creme, further testing/inspection required
  19. jimmbo

    Fastwin 18 - Help IDing Part

    Yes, that is the Idle Speed Adjustment Screw. Turning it In or Out determines how far you retard the Spark Timing, which is what determines the Idle Speed. The Carb is to remain Fully Closed. Adjust it until you get an Idle Speed you are happy with. My Dad and uncle were fans of backing the...
  20. jimmbo

    1997 Mercury 9.9 Vent screw turning on air

    That's one way to do it. I was thinking along the lines of using one of the Epoxy Putties, to fabricate an extension of the screw, to be gripped. I ran the Serial #, there are 2 main variations of the Gearcase, but neither use the 2 Vent Screws, I had earlier made reference to. I will send the...
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