Don't be so certain that is any different on the water, Morons are Texting while Steering the Boat, and often have NO Clue regarding Right of Way
I think you will agree that Weekends have better Entertainment at the Launch though
Back in 2013, I made a Ring Tone from a Song on Family Guy "Bag of Weed" Weed wasn't Legal yet, and it did turn Heads. Since 2017, weed is Legal, and everywhere, so the Shock Value is gone, but the Tune is Catchy so I still have it as the Ring Tone
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...
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...
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
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...
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...
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"...
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...
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
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
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...
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
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...
