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  1. jimmbo

    Engine, Carb or Prop? need suggestions or ideas please.

    I would consider a Big Block, more Torque, attaining Horsepower at lower Rpms.
  2. jimmbo

    85hp Merc?

    The Pistons in a DC Engine were a lot different than regular Crossflow Direct Charge Piston(with Power Port) Crossflow Piston
  3. jimmbo

    Transom saver or no?

    Good Luck!
  4. jimmbo

    85hp Merc?

    deleted
  5. jimmbo

    85hp Merc?

    Rule of Thumb for years has been 1 mph for every 5hp Increase. I also factored that your 50hp was Crank Rated, and the 70hp was likely Prop Rated. so I added a bit to the estimate. If both engines were rated the same way, the increase would be about 4 mph. The 70 is a Larger Displacement, so it...
  6. jimmbo

    85hp Merc?

  7. jimmbo

    85hp Merc?

    About 5-6 mph higher top speed
  8. jimmbo

    Silliest Question on Fuel Mix - Thank you for your patience

    Sometimes the Obvious needs to be stated to get through to some
  9. jimmbo

    2 Stroke Oil Thread

    How is it better? Oil for Air Cooled Motors does not meet the Requirements for Water Cooked Engines. Detergents are Different too
  10. jimmbo

    Silliest Question on Fuel Mix - Thank you for your patience

    Insufficient Oil, regardless of how Good it is, will result in a Damaged Engine.
  11. jimmbo

    Silliest Question on Fuel Mix - Thank you for your patience

    The 1957 thru 1963 35hp and 40hp, as well as all the V4s 58-63, were fully Antifriction Bearing, and could tolerate a 50:1 provided a TCW Oil was used.
  12. jimmbo

    Silliest Question on Fuel Mix - Thank you for your patience

    That engine has Anti-Friction Bearings throughout, the OP's Engine has Friction Bearing aka; Bushings. These need significantly More Oil, mainly to prevent Metal to Metal Contact, especially in the Connecting Rod Bearings. Leaner Mixtures, even when superior Oils are used, don't provide enough...
  13. jimmbo

    One last try

    That is what I considered a Jumpstart, done standing on a Dock, or a Raft. I did a lot of Knee Deep Starts, even succeeded on my 1st Attempt back in 1975.
  14. jimmbo

    2 Stroke Oil Thread

    Put it this way, Amsoil is not a TCW-3 Certified Oil, so using it might be a Risk. I don't know about the Stihl Oil, what I remember about their Oils, was that they were for Air Cooled 2 Strokes, which run considerably Hotter than Outboards and thereby place different Demands on the Oils.
  15. jimmbo

    Transom saver or no?

    If the Motor flopps around, then yes a Saver may be a good Idea. If the Motor is Locked Rigidly by Hydraulics, then Avoid them, because if the Boat shifts ever so slightly forward or backward, a lot of Stress is placed on the very Transom you think you are protecting
  16. jimmbo

    Silliest Question on Fuel Mix - Thank you for your patience

    If it says 16:1. use 16:1 even with the TCW-3 Oils. That motor uses Friction Bearings, and needs Lots of Oil to Survive. it will also help keep the Mosquitoes at bay
  17. jimmbo

    Evinrude big twin 40

    Oh, you have calibrated Tachometer Ears...
  18. jimmbo

    Evinrude big twin 40

    You need to be running between 4000 - 5000 rpm, preferably closer to 5000. Any Idea what the Pitch is on that Prop?
  19. jimmbo

    1978 Johnson 140hp running rough. Need advice

    They certainly not my Favorite Item either, but many times I have removed them on Carbs that the Owner insisted were spotless, and found a pile of Gum/Varnish/Dirt hiding behind them with no way to get out. On the Carbs with fixed Idle Jets, Settings like the Float become Critical, as well as...
  20. jimmbo

    1978 Johnson 140hp running rough. Need advice

    Did you take the Carbs off, and clean out all the Passages, including any that are covered by little Disc Plugs? Those would need replacing so, Carb Kits are needed. Are the Floats correctly Set. Is the Fuel Pump providing enough Fuel. Once reinstalled the Sync between the Carbs and Spark...
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