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model# ?-----Saltwater motor?

A 3.9 HP or 135 HP ?----Last " red band " was considered to be 1971 model year.------Picture of your motor?

The fuel in a carburetor bowl is NOT under pressure !

Loosen the bolt with a 5/8" wrench.-----Spread the arms to release pin.

Whenever a motor came in for recoil repairs I would ask if the motor was hard to start.-----Answer was usually ---YES.-----Owners get mad and become violent on recoils.

Find the 2 arms near the bottom carburetor ???-----Use a 5/8" wrench to spread those arms.----Release pin under bottom carburetor.

Your local Mercury dealer should be able to help you.

Good luck with it.

You must get a good fit / contact.-----Simple as that.----No good as it is now !

Your manual is for 73 t0 1990 models.-----The motor you are working on is a 1997 according to the model number.???-----Very puzzling what motor ( oil injection ) you actually have there.------Post some pictures I say.

Did you read post #17 ???----Obvious to me why the key shears !!-----Get some grinding compound and lap those tapers.

The starter on a 93 and newer 15 HP is not much different than the starter on a 1963 model 10 HP.----Except newer housing is plastic.

Sounds like an international motor.-----Your location ?

Sounds like it is running on 1 cylinder.-----I can not see , feel or hear your motor.-----Trouble shooting must be done by you.-------Remove top plug wire.----Try and start the motor.-----Repeat with removing only the bottom plug wire.

Model # of the motor ?------Or post some pictures as it is confusing as to what you are working on.

That is the manual start " commercial " model.-----Marketed to the brawny fishing types.-----Look for electric start kit I say.

A 1982 model.-----They sound good to the untrained ear , when running on a hose.----Not making enuff power to push a boat.-----Should be easy to figure out.----Perhaps flooding.----Fuel pump diaphragm ruptured ??----Nozzle gasket missing?----High speed jet inside the carburetor bowl plugged.

Correct -----The black wires are for the trim gauge.-----Not installed on every boat !

I believe It is the ---" tilt limit switch "-----On some boats the cowling might hit part of the boat.---Prevents damage to the cowling.------It is easily adjusted with no tools required

Model #, pictures or year is helpful.-----Sounds like it might be running on 1 cylinder.-----Check reed valves.---Does spark jump a gap of at least 5/16" on a test device ?----Post compression test values.-----Check flywheel key.-----Check for blocked exhaust housing.