Search results

  1. jimmbo

    Dual Prop Pitch vs WOT rpm?

    The same Rule should apply, but it would be best if they were to contact Mercury or Volvo so there is no Doubt
  2. jimmbo

    Loses power at 5000 rpms

    There is a slight chance it is a Fuel Problem if the Boat has a Built in Fuel tank, and the Tank Vent is restricted, partially plugged. Verify the Overheat Sensor and Horn/Light are working first though
  3. jimmbo

    1981 35hp evinrude. What to do next.

    Someone has already been messing in there and has shortened One Wire too much. Love the Mess on the Hot Solenoid Terminal. The One Red wire, looks like it had gotten shorted to ground, got Hot, and melted the Insulation, since there there are other wires in the Harness, their Insulation may...
  4. jimmbo

    Help identifying v4 johnson

    Looking at the Pics again, the motor has had at the least the Heads off, as the Gaskets don't have any Paint on them. In the one pic, where the Convex Disc with the Serial Number would be, somebody stamped 020 06 07. I will guess that might mean 0.020 Overbore, and June 07 The Decals on the Cowl...
  5. jimmbo

    1981 35hp evinrude. What to do next.

    An 81 would still use, a pretty much a basic old fashioned Carb, with a High Speed orifice, and a Adjustable Low Speed Needle, and a Choke Valve, not really much different from a mid 60s 40hp, except those Carbs had an Automatic Choke
  6. jimmbo

    Help identifying v4 johnson

    A 1984 140 would have the Bubble Back Tuner, a 1984 115 would have a Flat Exhaust Cover, a post 84 115(prop Rated) would have a Bubble Back Exhaust Tuner. It very might very well have the same Carbs as the pre 85 140(crank rated). Being that it has a VRO places it post 83. Odd that the Block has...
  7. jimmbo

    115 6c TOP piston cylinder issue

    Those are a Onetime Use Only Screw/Bolt
  8. jimmbo

    1981 35hp evinrude. What to do next.

    Welcome to iboats One of the First things you should do, is make sure there is some Gear Oil in the Lower Unit. Next would be at minimum a new Water Pump Impeller. But before that, I would recommend a Factory Service Manual for that specific Year and Model of that engine...
  9. jimmbo

    Mercury 850 85hp. Good engine or stay away?

    The Impeller was long past its Best Before Date. I bet the New one didn't have bent Vanes I just love Burry, out of Focus Pics, makes it easier to give parts a Pass. You did get the Vanes curved it in correct direction, when you lowered the Housing over them
  10. jimmbo

    GPS Speedo

    You don't need a GPS to calibrate a Pitot Speedo, in fact, using that to Calibrate it would likely make it inaccurate, unless it was done in a Slough, or a Pond where there would be no Water Flowing through it. Pitot Speeds are simple Pressure Gauges, bound by the Laws of Physics As for...
  11. jimmbo

    GPS Speedo

    Gee the poor waterskier/wakeboader, especially in a Tournament, is gonna have an Eff of a time if a GPS Speedo is used instead a calibrated Pitot Speedo, even a one mph error, will cause problems GPS speedos can also bring Planes Down, as Air Speed is what keeps Planes in the Air, so with a...
  12. jimmbo

    GPS Speedo

    GPS does not show the Speed with regards to the Water, if there was an 8mph current, and Pitot Speedometer says 28mph. In one direction, going against the Current, the GPS reports 20mph, 180 degrees the other direction, with the Current, it would report 36mph
  13. jimmbo

    Johnson won't start

    Inner and outer Seals? I suspect he was referring to the Seals on the Propshaft. Sounds a bit excessive to me as both seals can be replaced without even taking the Bearing Carrier out. Easier with the Official Tool, but not that difficult. For that kind of money I would be expecting all the...
  14. jimmbo

    1991 OMC Cobra 2.3L - can't reach max rpm

    Have you verified that the Carb is opening Fully? Another thing, since you have bought the unit Used, what is the Gear Ratio of the Outdrive? If by chance the outdrive was replaced, perhaps it has the Wrong Ratio, and thus a 17" Prop would not be the correct choice FWIW, don't rev the engine...
  15. jimmbo

    Tilt and trim bracket cracked

    That is my Philosophy when it comes to Wives...
  16. jimmbo

    GPS Speedo

    Waterspeed is Imprtant/Critical to several Boating Activities
  17. jimmbo

    GPS Speedo

    Wrong, the GPS will not give a true Water Speed, when there is a Current. It will give an Accurate Speed, in regards to the Ground below
  18. jimmbo

    Tilt and trim bracket cracked

    Properly focused Images of the 'Crack' would have been helpful. Casting Mark did cross my mind, but being that there wasn't one on the Starboard Side of the mirroring the 'Crack', I pushed it aside
  19. jimmbo

    Is it capable of planing?

    The Motor will not be making 25hp at 7500 ft above Sea Level, it might make between 18 to 20 hp. so that is one factor, it will also require a substantial reduction in Prop Pitch to run in the WOT Rpm Range. The EFI should sense the reduction in Air Density and adjust the amount of Fuel used, so...
  20. jimmbo

    GPS Speedo

    I wouldn't trust a GPS Speedo on a River, or any body of water that has a Current. Or for any Tournament/Competition Skiing Event
Top