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  1. jimmbo

    Mercruiser 165 6cyl inline dies when boat is in the water

    Out of the Water, one or two dead Cylinders and the Engine will appear to run okay, but once there is Back Pressure, from the Water blocking the Exhaust, that will change. All the Cylinders are fed from a common Carb, so unless there is a Leak where the Manifold meets the Head, I would focus on...
  2. jimmbo

    1975 Johnson 70hp

    I used to use Lacquer Thinner for Cleaning Carbs, it removed Dirt/Gum/Varnish and if they were left on the Carb, Plastic Parts. SeaFoam is mostly Oil and Naphtha. I have found just about anything, including Pine-Sol to be a better Cleaner. Oil in a Carb, well the Carb gets lots of Oil, as it in...
  3. jimmbo

    1992 Mercury 100 HP 2 Stroke Starving?

    Even though it doesn't get as Hot under the Cowl as it does under a Car Hood, those hoses can and do get brittle. I doubt the use of the Zip Tie was an Issue
  4. jimmbo

    1992 Mercury 100 HP 2 Stroke Starving?

    Could be a lot of things. That last 15% of the Throttle Movement, can more than double the Fuel consumption rate. Too bad you didn't do some Troubleshooting while on the Water, as you could see if anything made a Difference. Now you can only Idle the Motor, not putting it under load. It does...
  5. jimmbo

    Need different prop for pulling

    A GXI is a Fuel Injection Motor, correct? If so, it would have a Higher RPM range to to get 270hp out of 5 liter. The 260hp version of that motor was 4800-5200 Rpm(and it was way slower out of the hole, than my 260hp carbed 5.7 VP). Find out what it is, "I believe..." is not the correct Answer...
  6. jimmbo

    55hp johnson idle issue ?

    How does it run at higher speeds?
  7. jimmbo

    Need different prop for pulling

    A 22 footer is asking a lot of a 5 liter. Even propped for the top of the WOT Range, is not gonna be a Ball of Fire out of the Hole What WOT Rpm are you currently getting? I suspect the WOT Rpm Range for that Engine is 4600 to 5000 I would guess than with a 1.66:1 Final Drive Ratio, that a 21"...
  8. jimmbo

    1958 Evinrude Bigtwin 35/1969 Evinrude Ski Twin 33 powerhead swap

    A lot of people think that cause the Displacement, Bore and Stroke, even the Rated Rpm and Rpm Ranges are the same, that the 57, and some of the 58-59 35hps, and the later 33hp, are the same Identical Motor. In 58 and 59, there were two completely different 35hps motors by OMC. with not a lot of...
  9. jimmbo

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

    Okay I was curious, cause Time and Time Again, I have come across those who drop Auto-Truck Engines into a Boat, and the Performance is worse than an Engine of half the Hp. It might eventually get to the correct Rpm Range, but might take 10 minutes, of Poor Acceleration
  10. jimmbo

    How do you trim?

    I have never understood why so many People have Trouble with Trim Settings. Heck I learned how to do it before I was 14, and it took all of a couple of Hole Shots
  11. jimmbo

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

    Was that a Marine 4.3 or some Auto-Truck engine you put in?
  12. jimmbo

    1958 Evinrude Bigtwin 35/1969 Evinrude Ski Twin 33 powerhead swap

    I know the Pistons are different between the 58 motor and the 69. Might just be the Tin Plating used on the newer Motor, but... I would put some Plasterzine on the Top of the Pistons and check the Clearances. You are planning to swap the Heads, and the Recoil, so you might as well transfer the...
  13. jimmbo

    WOT timing value on a 90hp johnson?

    Careful, your motor can also be here today, gone tomorrow...
  14. jimmbo

    1955 Evinrude Fleetwin 7.5hp carb kit?

    Earliest Parts listing I could find online is for a 57 7522. https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1957&hp=7.5&model=7522 These are listed for the 7518 https://www.marineengine.com/newparts/part_search.php?part_num=18-7043
  15. jimmbo

    Just thought I'd share a nice photo.

    Where the Eff did 50 Years go, and so Fast?
  16. jimmbo

    Make model identification help

    9.9 or a 15 Johnsons were never Blue, that is an Evinrude Too bad the Cowl is Painted, it was easy to identify the yr of the Cowl of an Evinrude
  17. jimmbo

    1976 Evinrude 35

    OMC used a few different Ignition Systems on that lineage of Motor. The Low Tension System used on the 76 model is quite Reliable and easy to service, and Service Parts are easy to attain. Those neat Electronic Boxes on later Motors, are not serviceable and require replacement when they fail...
  18. jimmbo

    1967 Johnson 100 hp Meteor outboard

    Racer is referring to the Battery Ignition system of the some of the V4s from 1961 thru 1967
  19. jimmbo

    1958 Evinrude Bigtwin 35/1969 Evinrude Ski Twin 33 powerhead swap

    I think the Heads are different, not just because of the Compression Relief on the 58, but because the Cowl attaches to a Bracket on the Head, might also apply to the Crankcase.
  20. jimmbo

    WOT timing value on a 90hp johnson?

    WOT Range for a 96 90hp Crossflow is 4500-5500. The 90 makes its Peak Hp at about 4700-4800rpm Isn't there a Sticker on the Airbox that states WOT Timing? 28 BTDC was common on the 90hp. However, setting that at cranking speeds could yield a different value when running at High Rpm due to the...
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