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You have to take lower unit apart to check shifter and forward gear.-----There is no adjustment features on these.

No power to either one is FORWARD on these.

Paint color is for 72 models,

Remove lower unit.----Take it apart.------Evaluate all parts.------Take note of driveshaft and bushing above the pinion.-----Do compression test and post the numbers.----Pull flywheel and inspect ignition coils.

This motor suffered from severe overheat.----Do a compression test.----Post the actual numbers here.

Overheating ?-----It does sound like it is running on 2 of 3 cylinders.----Post compression numbers here.----Check spark.----Check flywheel key.----Does primer bulb go hard ?-----Running with VRO in service ? ----Tested VRO oil output ?

It has wire core sparkplug wires and not automotive ??

Manual release closed ?

Check / replace the oil recirculation hose.-----Also check the mounting bolts for the starter motor.

That means you have an electrical issue in wiring harness or detective shift switch.-----The new switch is pricy .----Take control box apart and inspect.-----Your location ?

Then switch wires and report on what happens.----And there is no need to run the motor for this test.----Prop can be turned one way and not the other way in gear.

You need to learn to work on this simple motor.----Few shops will help you with older motors.

????-----It will stop when you pull the HT boot off the good cylinder !

Oil is supposed to be in the recirculation hoses.

Find the green and blue wires at the back of the engine.-----One simple test you can do is switch the wires at the motor.----Report if you now have forward and no reverse.

Post the actual compression numbers.----Do a complete evaluation of the motor before spending any beer tokens.

Running on 1 cylinder I think.

Inspect clutch dog and forward gear.-----Find the cause of your issues with this simple set-up !

Did you take these lower units apart before installing them.----So easy and simple to do , ----Well in my opinion it is easy.----First worked on these lower units in 1968.----That was when your motor left the factory !!

Not odd at all in my opinion.-----Are the notches on shift rods both lined up with the hole in connecter ?-----Is shift adjusted properly up top on the motor ?-----And lower units are easy to inspect internally.-----And finally you are sure it is not the rubber hub slipping inside the prop...