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  1. jimmbo

    Sea foam for outboards?

    Stabil is far better than SeaFoam. Actually, just about anything is better than SeaFoam for Storage, or Engine Cleaning.
  2. jimmbo

    Camshaft specs. needed, modification feasible?

    Since that 2bbl was not likely calibrated for use with a higher performance Cam, all kinds of Operational issues can occur. Most are along the lines of Stumble and Bogs, due to the Idle and Off Idle Fuel Systems as well as the overall Fuel Delivery Curve, including when the Power Enrichment...
  3. jimmbo

    Trouble coming on plane

    So how long have you owned the Boat?
  4. jimmbo

    carburetor suspect problems

    The pics showed the Choke Plate closed.
  5. jimmbo

    carburetor suspect problems

    I got bored reading the previous posts Your engine HAD a Divorced Choke. It currently has no functioning Choke, cause the Brainiac who chose the Intake, picked an Automotive Intake intended for use with a Carb with an Electric Choke. The Choke Plate is just flapping in the Breeze and relying on...
  6. jimmbo

    outboard interchangeability’s

    Possibly some of the Screws/Bolts. Get the Parts Lists for both and start comparing
  7. jimmbo

    1977 140 carb replacement

    If the Throttle Shafts are loose, and letting Air in, causing problem getting Consistent Idle, then the Carb is pretty much a Paper Weight. Corrosion on the Power Valve should be removable, with a bit of Polishing. Every Carb Kit I have ever seen, included a Needle and Seat, for the Float...
  8. jimmbo

    Evinrude 15 1992 carburetor cover change

    I suspect it is not supposed to open the Carb at the Start Position. The Timing advancing is what gives the Higher Speed at Startup.
  9. jimmbo

    Happy 4th of July to My Neighbours/Friends to the South

    Happy 4th of July to all the fine Americans, I have met on this Board
  10. jimmbo

    Reversed polarity 40 hp Mercury -Coughs but it won't start

    Welcome to iboats Any idea what yr the engine is? 2, 3, or 4 Cylinder? You hooked the Battery up Backwards? That pretty much fries the Recitifier, so no charging and no Tach. Switchboxes and other Ignition Components usually survive, but I guess they too could be fried. Have you tested to see...
  11. jimmbo

    Loss of power, won't plane

    Running out of Summer? That doesn't happen for another 4 weeks, until after the August Long Weekend. At least that's when summer ends in Alberta. In 1977, I remember snow falling in Late August, Disgusting
  12. jimmbo

    Loss of power, won't plane

    WaterFlow. Your motor doesn't have the Bubble/Turtleback Exhaust Cover, but the Flow is still the same This shows the Orientation of the Gasket. You really should get a New one if the current one was installed flipped.
  13. jimmbo

    Loss of power, won't plane

    Did you take the Cowl off, and look for water coming out of the block?
  14. jimmbo

    Trailer driving lights do not work, what I've done so far...

    One way to reduce the Odds of it blowing again, is to unhook the Trailer Lights, just before you put the Trailer in the Water. Regardless of how "Water Tight" the wiring is supposed to be, it rarely is, and undistilled Water, is an excellent Electrolyte.
  15. jimmbo

    Prop size 1989, Mark cruiser, 3.7,18.9

    In 89, the WOT range might have been 4400-4600
  16. jimmbo

    Prop size 1989, Mark cruiser, 3.7,18.9

    Unless you know what Rpm the motor hits at WOT, you will not know if you are propped correctly. You also need to know what the WOT Rpm Range for your engine is.
  17. jimmbo

    1977 140 carb replacement

    It was a Rebuild, with an "update" to an Electric Choke.
  18. jimmbo

    1977 140 carb replacement

    You really don't have a lot of Options, as these are Marine Carbs. Don't get any Ideas of sticking on an auto/truck Carb in its place
  19. jimmbo

    VP 4.3GS Carb Tuning Vacuum Port?

    You could do that, the reading on the Gauge will be lower, but it can be used, for tuning
  20. jimmbo

    1977 140 carb replacement

    $345 https://www.marinecarburetors.com/products/marine-carburetor-2bbl-rochester-2gc-4-cyl-mercruiser-1351-5203a1-electric-choke
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