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From what I am seeing the hose is still available. The jet from Suzuki, apparently not. But if really needed I suspect www.jetsrus.com could come up with one if needed.

All vacuum lines do not have such a device. Appears to be a restrictor of sorts to help dampen the pressure changes within the hose. What year 2.5 motor? Do you not see the part in the applicable parts catalog?

Any type of propeller can be too much, or too little, for any size or type of motor. That is why there are so many models of both materials in any number of diameters, pitch, number of blades and shapes of blades. One size or type does not fit all. Different folks want different things. As...

Shape and size of the blades also comes into play.

It is a cryin shame that someone with no idea what they were doing removed the oiling system. Very very reliable. Less mess. Less chance for an oil related failure. Given the age of the motor, the availability of the needed parts, and the cost thereof if you can find them, I would leave the...

A no should be taken as a no. Your intentions are well meaning but no is no. Try another forum.

Different part numbers, different fuel pump and injectors. PSI output from the pump depends upon the pressure regulator, not the pump.

No choke in a 2003 Yamaha F50.

What is the motor doing or not doing?

All of the Yamaha specifications can be found in the applicable service manual. https://www.yamahapubs.com/home/search?category_id=4&year=2003&family_name=F50TLRB

Posted below is what Yamaha has to say. That is all I have ever heard from them about this problem. Again, they offer no theory of operation as to what should be happening and when, and what happens if and when things don't go according to Hoyle. Millions of things in life that I have to accept...

I am thinking that I would disconnect the CDI connector and inspect the terminals, particularly those for the yellow wire. Maybe then get a 12 volt incandescent bulb that has a current flow of about 5 amps when powered by a battery. Connect the bulb to the yellow wire on the engine harness side...

When doing the compression test, was the motor fully warmed up, throttle wide open, battery fully charged and the gauge known to be accurate?

Good question. Wish I knew but Yamaha is very vague as to the theory of operation with respect to their systems. My guess is that it is to power the five volt circuit for the three wire trim sensor and other components that utilize five volts.

Did you post your problem on another forum? Sounds very familiar.

The stator has different functions. Coils to charge capacitors in the CDI unit, coils to fire the ignition coils/spark plugs and coils to charge a battery. The coils for ignition can be working just fine (motor operates normally) while the coils that charge the battery are not. Or both coils...

Weird only to those that do not yet know. What you are seeing is indicative of low voltage to the CDI unit.

It is not a solenoid. It is merely a resistive heating device that can be powered by AC or DC. Powered by AC from the lighting coil when the motor is running or powered by DC from a battery when being tested. When cold it allows more fuel to flow helping to start a cold motor. When warm it...

OP says he sees 13.5 volts at the battery. Given enough time the battery will be fully charged.