Improper Float setting, Heavy Float, leaky Needle and Seat, loose Seat, too much Fuel Pressure, any of which can cause a High Fuel Level.
Incomplete Cleaning of all the Fuel Passages can cause Leanness especially in the Idle and Off-Idle circuits. That is why Carb kits contain those little...
For Decades, Landlords were able to screw Tenants over in every which way or form, so the Pendulum has returned closer to Neutral. I long for the Day when the System is biased in favor of the Tenants
I have never seen a Vanguard Barretta with a built-in Tank. Likely about 10 Gal(Imp).
You suspect there is no Oil it the Fuel? No residual Oil after Evaporation?
Thing is, you aren't around to Reap the Payout.
YEARS ago, MAD Magazine had a Drawing, showing a Corpse with Big Smile, cause he had a big Life Insurance Policy...
In the Paragraphs above, are some clues as to where the Problem might be
You are assuming the Pump is fine, cause you rebuilt it.
There was no change in how the engine ran when 2 of the Plugs were disabled.
How did you determine the Carbs were clean Internally?
Where did you verify the Fuel...
"Chugging and Clunking" Noises, describe a large variety of Issues, from Misfires through Impacts. Best to pull the Boat, just to make the Inspection much easier
The 100:1 Ratio was retracted by OMC, probably because of lack proper Mixing, but they claimed it was because of a lack of Oil on the Internals potentially during extended Downtime, was the Reason. The early VRO System did go leaner than 100:1 at Idle, but even it, was providing about 50:1 at WOT.
No, it is not the Size, Airflow wise, that the Engine was designed for. Incorrect Carb size, and resulting improper operation, make an Engine a Chore to Operate, if it even runs. But some people have to Experience the Problems/Issues themselves....
Yes the Models with Power Trim from the Factory did have a 10 Amp Alt. I would verify that the Dash Voltmeter is Accurate, and same goes for the Tachometer, as you would need to have a very Light and Small Boat to get that engine over 5500 with a 19 in prop, unless you have a lot of Slippage...
Pretty much every Used Engine I have ever seen as been described as running Perfect the Last Time it ran, even the Ones that had Broken Piston Rings, and even a Hole in the Crankcase...
First things first.
Is there Oil in the Gearcase?
I would suggest an Inspection of the Water Pump, and a New...
That Engine's charging System is Unregulated, and as Rpms increase so will the Voltage. The Battery is the Regulator, and while the Voltage is a but high, the Current is not that great(If I recall, the Charging System was rated at 6 Amps).
However, what exactly is the the Rpm you get when it is...
