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One good battery will do.----Use booster cable directly to the starter to eliminate the cables / solenoid as the culprit.-----Find the issue with the system.----Take starter apart.----Very easy.----Then do an ohm test on armature.------Perhaps replace brushes.----Inspect cables.----Not sure why...

Nope--Not the power ports.--Those holes ( circled in red ) must have a nylon insert with a specific hole size.----They are called " bleed inserts " by Mercury.-----I often find 3 of 5 missing.-----I install 8-32 stainless setscrews with correct hole size in them.----Never to go missing again.

100,000 tons.

Marine engines need a new rubber impeller about every 5 years !!

Agreed----Impeller is at least 7 years old and likely not replaced by previous owner.--So could be 15 years old.----Put a new one in every 5 years.

The flywheel taper and crankshaft tapers must be lapped together for a precise fit.---Use valve grinding compound.------The key locates the flywheel for correct timing.----The flywheel is driven by the locking tapers.----And 50 ft-lbs is correct for the flywheel on a 76 model 25 HP.----Tapers...

Test run with another fuel tank.

I think you candle this job on your own.----No need for the industrial language.

Are you sure wires are colored like that on a 25 HP 76 model ?

A 2 stroke.-----Mix gas / oil 50:1 in the tank.

Fuel pumps are driven by pressure pulses from the crankcase.

Looks like this motor has suffered from a SEVERE overheat condition.-----Do a compression test and post the actual values.----Do not spend any beer tokens on this motor until after you have done a complete evaluation of it !!!

Good luck with your motor.

Ignore post #70----Wrong thread.

Remove white wire from safety switch.----Touch that wire to ground.-----Have your assistant try and crank the motor with white wire grounded.

No need to worry about the boat sinking.

See post #99.-----And it takes a lot longer to build / repair a boat than what they tell you.-----Think about looking for a motor next year at this time.

Post pictures of the motor-----I am sure it is a 2 stroke.----Best to get a book or manual on outboard operation.--Read it twice before you turn the key.--Is there an oil filter ?-----Is there a dipstick ?-----Is there a timing belt ?----Put a new water pump impeller in the motor before...

Suzuki is my bet.

I guess you are another doubter !!----Good luck with your motor !