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  1. jimmbo

    Suggestions on how to fill my onboard gas tank?

    I will stand with that Statement. I had read about it several times back in the 70s
  2. jimmbo

    I Know What Happened But Why?

    If the Flywheel Nut has been over torqued, it stretches the Taper, and that can cause Problems, including Shearing, down the road
  3. jimmbo

    What oil should I use?

    It is Blended to a Spec that Mercury specifies
  4. jimmbo

    Suggestions on how to fill my onboard gas tank?

    Actually, if the engine is completely Antifriction Bearing, including Piston Pin, it can survive running at idle with No Oil.
  5. jimmbo

    What oil should I use?

    You really can't Go Wrong, by following the Manual.
  6. jimmbo

    Suggestions on how to fill my onboard gas tank?

    Premixing prior to adding to the Boat Tank is the only way to insure a Consistent Mix. Contrary to Popular Belief, the Oil does not Self-mix very well, especially when the Tank is more than 1/2 full and not subject to serious G Forces to sloth the Mix around.
  7. jimmbo

    Mercury thunderbolt 500

    There is no hole. The Key in this case, fills the Void in the Driveshaft
  8. jimmbo

    Mercury thunderbolt 500

    The Key that connects the Impeller
  9. jimmbo

    Mid1980's Mercury 2cyl 35hp Spark Plug Question

    Racer is correct about what to do with the Auto Blend thingy.
  10. jimmbo

    Prop selection help

    Those Numbers don't add up. A 15" turns 6150 rpm and gave 25mph. Then you say a 13" turned 5800 rpm and gave 31 mph. A lower Pitch Prop, spinning slower doesn't give higher Mph. Even the Numbers for the 16" don't follow the usual pattern.
  11. jimmbo

    1966 model 18602 18hp eventude

    That case has been apart before, as OMC used a Hardening Sealer along with the Spaghetti Seal from the Factory. Sealer 1000 was that type of Sealer, but that was back in the 60s The sticky Brown stuff is pretty much the Same Stuff and Edelbrock's 'Gask-a-Cinch', or Mercury Perfect Seal.
  12. jimmbo

    Mercury thunderbolt 500

    Based on the Cowl and Faceplate Decals, I'm almost 100% certain it is a 73 A 73 has Mercury Marine on the Face Plate, a 72 would have Kiekhaefer Mercury In 74 the two blue stripes would have not gone under the Face Plate. Granted, this is my 1984 115, kinda looks like a 71, cause I put the 71...
  13. jimmbo

    Mercury thunderbolt 500

    Just looking at the Decal, likely a 72 or 73, with a slight chance of 74
  14. 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.
  15. 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?
  16. 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
  17. 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?
  18. 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
  19. 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...
  20. 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...
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