Search results

  1. jimmbo

    1978 Evinrude 140 V4 Only firing on 2 cylinders

    The old Crank rated 140 and 115 had the same porting, and keeping track after the switch to Prop rating is like looking at a bowl of spaghetti. The Bubbleback did change the Exhaust tuning, whether or not they ever bolted it to the 90hp block, I don't know, but it may have upped the power a bit...
  2. jimmbo

    Johnson 25hp

    Where in Canada are you? No Marine Dealers nearby?
  3. jimmbo

    I/O taking on water while sitting not moving

    Leak between the Raw Water Pump and the Transom Plate. When Engine is running air will be sucked in, so no leak, but when Engine off, water is able to leak out
  4. jimmbo

    Upgrading from 70hp to 90hp

    Do you have a Picture of it?
  5. jimmbo

    Johnson 25hp

    I would recommend the Grease that OMC speced, or its equivalent. Mercury Marine also markets some Excellent Greases for use in Marine Applications. Of course it is your engine, and you could use any grease you want, even Bacon Fat if you wanted to, but I say stick with the specified Lubes
  6. jimmbo

    70's Johnson seahorse 35 issues?

    Higher Octane Fuels actually burn Slower, Cooler, which is how it reduces Detonation, and actually have fewer BTUs in any given Volume. As for Detergents, Regular has enough to keep an engine Clean. SeaFoam(Naphtha and Light Oil) really does nothing, as I said, there are better Snake Oils for...
  7. jimmbo

    Boat not planing

    Maybe the 25 needs a lower pitch Prop.
  8. jimmbo

    70's Johnson seahorse 35 issues?

    All those parts on the exterior of the Motor were engineered with getting wet in Mind Steep Launches and backing down them fast, is kind of Stupid. No, just make it Stupid. Motors are engineered to get wet, if some moronic reckless Launching Technique submarines it, all the grease in the...
  9. jimmbo

    I thought towing doubles was legal in some states? 😁

    I guess he never looks in his mirrors, Rearview or Side. Probably didn't know the cops were behind him, until they used the Siren
  10. jimmbo

    Upgrading from 70hp to 90hp

    I will assume the 90 is a V4, as 330lbs is what the later V4 90 weighed. Is it a Crossflow or a Looper?
  11. jimmbo

    Alpha drive for a V8 whats the ratio?

    2 or more Props with the same Dia and Pitch, can result in very different Performance. Blade shape, Blade area, Blade thickness, Rake and Cup are the reasons for the difference in performance. As for "aluminum is deflecting" go clamp a Visegrip on a Blade and see how much it flexes. That is just...
  12. jimmbo

    Help with my outboard!

    There are a couple of Check Valves in the Ball Assembly, if either goes bad, the Bulb will not function as a Pump. Sometimes they will fail closed, thus preventing the Fuel Pump from getting fuel.
  13. jimmbo

    Outboard top cylinder getting hot

    Too lean a mixture can cause heating/lack of lubrication, since your motor has a carb for each Cylinder, a Lean condition might not be noticed until Damage has been done. To name a few, but not all Improper Float setting. Restricted Fuel Supply to the carb involved. Restricted/plugged...
  14. jimmbo

    I thought towing doubles was legal in some states? 😁

    And some people still refuse to add a Chain, or Rope to fasten the Bow Eye to the Winch Stand, or use Straps to secure the Stern... I wonder if Henry and Harold Handcuff, ticketed the Guy for driving with Undue Care and Attention?
  15. jimmbo

    Help with my outboard!

    I was referring to priming the Water Pump, it needs to be submerged, as it is several inches above the water inlets
  16. jimmbo

    Help with my outboard!

    Some 25 hp mariners had Head Gaskets
  17. jimmbo

    1990s Mercury 90 HP Lower unit mounting nuts

    I found the nuts that hold the gearcase on to be part #11-40140 M10x1.5 threads
  18. jimmbo

    Help with my outboard!

    You need to have the water several inches above the Pump housing, to insure it is Primed. Ona lot of Outboards the Pisser isn't discharging water that made it through the Block, just water that has made it to the Block. As the Exhaust and water do mix in the Exhaust tube, some exhaust may find...
  19. jimmbo

    Upgrading from 70hp to 90hp

    A 20 hp increase will get you about 4 mph more top end. I guess there is a Chance that for one Year they made the boat differently and thus the reduced HP Limit. Myself, I have never worried about a slight Overpower. I always made sure the Underwriters of the Insurance, knew it was exceeding...
  20. jimmbo

    Boat not planing

    I have never seen a boat refuse to plane because of a 25 liter Portable tank being added to the Bow area, in most cases it improved the ability to get on Plane. The added weight of the Kicker is about the weight of 2 full 25 liter tanks Are you trying to plane the boat with the Kicker up or down?
Top