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  1. jimmbo

    Outboard flooding issues

    Welcome to iboats If the Diaphragm is ruptured, gas can end up in the Crankcase, making that cylinder run rich. Hopefully what Fuel was getting to the Crankcase via the Pulse Hose, was already mixed with Oil, if not... Do a compression check
  2. jimmbo

    1972 Mercury 402 lower unit off but stuck in forward

    Basically the shift Shaft is rotating the Cam, which pushes the Cam Follower in, moving the Clutch Dog. When there is no/little contact between the 2, the unit is in forward. Looking at the Cam you can see it can be rotated a fair bit in the wrong direction(no shift action) with little/no...
  3. jimmbo

    1990 V4 runs on two cylinders at low RPMs

    The Carb Kit should have those 2 silver discs #2, You need to remove the old ones to get any crap out of the passages. Your carb has fixed Jets for both High and Low Speed. Float Height needs to be checked and adjusted too
  4. jimmbo

    Part Identification

    Welcome to iboats First of all what is the Picture of? There is not Context as to location. The Orange thing, kind of looks like a Plastic Hub of a busted 3 blade Prop...
  5. jimmbo

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    Here is the OMC prop chart for your engine. A Dealer would have put a 15" on it. However, if the motor isn't up to Snuff, no prop is usable
  6. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    So the Advance is coming in early enough. 14" inches is on the Low Side, but Back Pressure in the Exhaust might be a factor. Any Idea on the # of Hours this engine has on it? By your Name, I will assume you are in the Vancouver Area. Vancouver BC or Vancouver Washington? What altitude are you...
  7. jimmbo

    1990 V4 runs on two cylinders at low RPMs

    Don't run it too much, cause if it isn't getting Fuel at low speeds, it isn't getting Oil, which becomes a real problem with a fast running Hot motor suddenly going to Low Speed
  8. jimmbo

    Prop makes clanking noise when put in gear.

    I hope you aren't "Easing" it into gear. What is the Idle Speed, in gear and in neutral?
  9. jimmbo

    Everything done but low rpm at WOT. Distributor spring?

    When you say Ignition Advance @3000rpm as 25. do you mean the Total Timing is 25 degrees, or the advance is 25 degrees for a Total of 37 degrees? 8400lbs, that is a lot of Boat. I wish I had my old Merc Accessory Catalogs, as they would give Hull Weights in the Prop Charts
  10. jimmbo

    KIA Telluride for towing?

    These are my Tow Vehicles. The smaller one is rated 5000lb, the bigger one 7000lbs.
  11. jimmbo

    Motor has no power under load

    And how exactly was your engine upgraded?, This outa be good...
  12. jimmbo

    Motor has no power under load

    I agree with Scott regarding these Motors grenading when overrevved even a bit.
  13. jimmbo

    40 hp johnson electric shift Model # 40ES 69R

    That Oil is not for Electric Shift. Precision Blend is the correct Oil. Hopefully you go to a Dealer who knows about the Electric Shifts, as they have been out of Production since 1970
  14. jimmbo

    Dribble of oil at prop, usual suspects checked, now puzzled

    How bad does it smell, the drippings? Gear Oil stinks to High Heaven, while Oil that goes thru the Engine, will smell of Gas and Oil
  15. jimmbo

    Double Cup or not, on a pontoon?

    Be prepared to be underwhelmed if you attempt a repitch. You are getting 5400 with the 13" Enertia, an 11 should put you at 5800. Enertia is a very good Prop, not cheap, but it is one of a very few that can deliver better Performance at the Top End, and also at Hole Shot. I got mine back in...
  16. jimmbo

    Double Cup or not, on a pontoon?

    There isn't an Aluminium Prop made that can perform the same as an Enertia
  17. jimmbo

    Prop Locking Question (Reverse Locking Cam?)

    The 65, 75, 80, and 85hp inline 4s had a 2.3:1 Ratio, and most inline 6 s, but not all, had a 2:1. In the mid 1980s the 2.3 was offered as a High Altitude Option on the 115 IL6.
  18. jimmbo

    Only goes 20 MPH

    #7
  19. jimmbo

    Prop Question

    I would love to hear the Rational regarding that one. I'm all Ears
  20. jimmbo

    1988 Force 125 HP outboard prop selection

    Before you start messing with Props, is the Engine firing on all 4 cylinders? Do a compression test, post the numbers. Does it deliver a Spark that can jump a 3/8" gap at each cylinder? Are the carbs opening fully when the Go Go Lever is at Full Throttle?
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