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Remove cables-----Shifter cable is the first one that moves.----Measure total travel of throttle cable from idle to full throttle..----Measure total travel needed on motor linkages from idle to full throttle.----Post what you find

??---A 1996 model 50 does not have optical ignition !

Age of a motor has nothing to do with simple adjustment job like this.-----Your location?

Different paint color ?----Is it the correct cylinder head for that motor ??-----Drill a hole in the lower cowling and put a rubber bung in the hole after plug work.

This should be simple to set up.----Trip to a boat shop is in order.----Making a multitude of ---" lets try this "--- adjustments can lead to expensive repairs later.

I doubt that the---S--- denotes " Sunbird "

They sorted this out 15 years ago I think.

I do not recall a stop inside these control boxes.

This motor was marketed by other people.----Try BRP ,Yamaha , Tohatsu fpr a coil

The pay is not very good here.-----Sometimes the " fun grade " is important !----Finished a boat repair yesterday .----Owner brought case of liquid in cans as a huge token of appreciation.

Run with a timing light hooked up.----One cylinder at a time.----Might be able to spot if it is one cylinder or all that is missing.-----You did replace the wee rubber boots where plug wires screw into the distributor cap ?

There is a huge mis-understanding on carburetors.----It seems it is the first item that folks pick on to start trouble shooting.----And the carburetor upgrade theory will not go away.-----No wonder that fuel injection is so popular !

Go for it.----Sounds like an opportunity for instant power upgrade.

Test the horn.

A 1979 would be white.----A 1979 has electronic ignition.------These motors were essentially the same year after year.----Great fishing motors and easy to maintain.----Check ignition coils.-----Check thermostat.

Decal was used in 1969.

In the 1960's and early 1970's all the OMC motors used type -C gear oil.-----Then HI-VIS came out and type -C was only specified for electric shift.

Put 6 drops of fuel into the sparkplug holes.----Install plugs and wires.----Pull on the cord.-----What happens?

The primer solenoid is a valve and not a pump.----Test with another fuel tank.-----There may be issues with venting.

To lower idle speed on most 2 stroke outboards you RETARD the timing by rotating the magplate or timing base.