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  1. jimmbo

    Mercury thunderbolt 500

    Just looking at the Decal, likely a 72 or 73, with a slight chance of 74
  2. jimmbo

    Surging Mercury (with audio)

    Have you had the Carbs off? If you did, after putting them back on, did you do what is called a Link and Sync? That is making sure all the Carbs are fully closed at Idle, and all are properly synced in regards to the Spark Advance.
  3. jimmbo

    Opinion on 1963 Evinrude 28 H.P.

    Before you went and spent Money on "points, condensers and coils, new water pump impeller, rebuilt the carb. resealed the lower unit and rebuilt fuel pump", did you perform a Compression Test?
  4. jimmbo

    Mercury thunderbolt 500

    Welcome to iboats A Serial # can provide a guide to finding out what year. For Decades, Mercury sorted it Parts and Service Info, based on the Serial #, not on the Model Yr. This was their way of Dealing with Changes/Improvements to the Engine, without many Addendums to the Lists/Manuals
  5. jimmbo

    Upgrading mercury outboard help!

    Mercury did make a few different 150s in that Era, and one was an Opti. You say there are no Merc Dealers near you, did you check Merc's website, for one? Your "Friend" didn't mention that you were getting only the Motor, no Harness or Controls?
  6. jimmbo

    Johnson 35 Lower unit swap

    I Highly doubt you are going to get a Gear Case from a 78 35 hp to work on an 81 35hp. Shift Linkages are Different. The 78 disconnects up in the Exhaust Housing, while the 81 disconnects in the Gear Housing, between the Water Inlet Screens
  7. jimmbo

    Low compression - 1986 Mercury classic 50

    Lots of things can the reason it takes longer to restart when warm. Fuel Percolating out of the carbs, can create an overly rich mix getting to the Combustion Chamber, which can make starting take longer. But first, is it cranking Slower when out on the water, versus being on the Muffs, and out...
  8. jimmbo

    Low compression - 1986 Mercury classic 50

    Welcome to iboats It doesn't sound all that Bad, however, running on the Muffs, really does tell anyone much, as it could be running on 2 cylinders, as there is no Backpressure, not being in the water, at Docked/anchoured Depth. Running tilted like that also creates its own problems as the Fuel...
  9. jimmbo

    Mid1980's Mercury 2cyl 35hp Spark Plug Question

    Fogging is the Term used for Spraying a quantity of Storage Oil into the Carbs, to coat the Rotating Assembly, protecting it from Corrosion during longer term Storage. Doing it, results in a Fog of Smoke. Applying Power Tune via the Plug Holes is done when the Piston Rings are badly Carboned...
  10. jimmbo

    What oil should I use?

    GM used to, maybe still does, market an Oil Supplement, aptly called Engine Oil Supplement(EOS) which they recommended during Break In. I recall the printing on the Can, saying it was good for Cam Break In. It was a delightful Chemical Stew, that while Thicker than Oil, it was runny compared to...
  11. jimmbo

    What oil should I use?

    Poppycock. I switched, from Dino Oil to Synthetic on an Engine with 110,000 miles on it, and it didn't leak, or burn it any faster. It now has over 250,000 miles on it and still No Difference.
  12. jimmbo

    Cant get new boat to plan out

    I am more Familiar with the 2 Stroke OMCs which said 4500rpm in the 2nd Hour, with 4 or 5 bursts of WOT for about 2 minutes, returning to 4500
  13. jimmbo

    Cant get new boat to plan out

    Bursts of Full Throttle are required Parts of a Proper Break-in Procedure, though usually not until well into the 2nd Hour.
  14. jimmbo

    towing - engine in neutral?

    I remember doing the Multiple Guess Test a few Decades ago. A lot of it was about Harbour Lights, Channel Markings, and those Floating Things. None of those are used out in the Land of the Right Wingnuts(Alberta)
  15. jimmbo

    towing - engine in neutral?

    Bunk Trailers are the Reason, as the friction is too high to winch on. Backing in Deeper, results in ruined Diffs and boat that aren't centered on the Trailer. Roller Trailers, work well with winches but not power loading.
  16. jimmbo

    towing - engine in neutral?

    I raise the Drive when I load, because I don't want the Prop coming in contact with the Bottom...
  17. jimmbo

    Cant get new boat to plan out

    Maybe the Sales Person is the Idiot.... and last week he/she was selling Lawn Mowers...
  18. jimmbo

    Mid1980's Mercury 2cyl 35hp Spark Plug Question

    That was Reference to the Brandings of Mercury and Quicksilver, I guess you really don't read the Postings
  19. jimmbo

    4.3 spark arrestor replacements

    I never knew non-marine boats existed, except the old Land Yachts of the Mid 70s
  20. jimmbo

    4.3 spark arrestor replacements

    A lot of work/expense for very little increase in power, plus the cost of Premium and likely an Octane Booster. If you want more Power, you will need a bigger Engine. A 4bbl won't do much if anything, unless it was too Small to begin with. A Holley 500cfm 2bb(370 cfm when flow rated like a 4bbl)...
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