Trying too establish what year this motor is it a 2 stroke 80 hp 6hoL450289 yamaha outboard motor.

Question edited for a lot more clarity and correct spelling of the maker.

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yamaha like all engine manufacturers are controlled by the EPA in the countries they are sold
In most countries the use by date has been established and 2018 is the end date that they can be sold with the start date being as early as 2015
So to comply with EPA requirements, yamaha would be allowed to sell off existing stock but the retail section ( local dealers ) would be restricted form selling them in certain countries
So to answer your question
No yamaha would not be making 2 strokes after 2015 as they could not sell them so any you see would be existing stock in dealers being sold off

To get the year of Johnson and Evinrude outboards use the word "INTRODUCES". Each letter corresponds to "1234567890" respectfully. It's best to check with a model year reference book, but this motor's model number contains "CC" which would indicate it's a '88.

Reverse polarity should only blow fuse,if solenoid is clicking but motor not turning then solenoid is faulty

2 stroke ?? choking up do you mean ? what oil make and mixture ratio ?

reg unleaded gas.

You haven't specified as to its year of manufacture, so if its older, as in a 2 stroke, it'll be a mix of gas and outboard oil.

If its a newer model, a 4 stroke, it'll be injected(Gas and oil seperate)

If you are totally unsure, Consult your owners manual and if you have none, then any Yamaha dealer can use the serial # off the motor to establish any specs on it for you.

Happy boating.