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Replace the thumb switch, then go boating

Coming back to this as I changed jobs and have additional perspective of design life....... a few miscellaneous ramblings over lunch A good friend of mine just left the automotive market with a member of the big three.........from dearborn..... the design life for the average automobile has...

sell the motor for parts, buy a new one.

your throttle cable is not connected its hard to tell, however the plastic bit bolted to the throttle arm may be broken or cracked.

Just remember, an owners manual would have had a list of servicing dealers in 1977 and a generic drawing of the boat indicating the pointy end is the bow and the end with the outboard is the stern. not sure what information you are looking for.

yes, you have to remove the anti-rotation bracket.

yes, hence the boxer motors that Subaru and BMW motorcycles are fond of .

key off in gear and the motor will kill

measure fuel pressure. lines running from pump to carb are steel, so you will need the test fitting. you should have 3-5 psi from the pump. fuel pressure will tell you if there is an obstruction

you are comparing gen 2 blocks and gen 4 blocks. like apples and yo-yos here is some light reading https://forums.iboats.com/threads/complete-history-of-the-4-3-liter-with-casting-numbers.693935/

remember, the balance shaft has bearings that are oiled by the oil passages. you cant just remove the balance shaft. the only thing you can do is remove the gear driving it. then, you do not get all the benefits of the balance shaft and the motor vibrates like a dog passing a peach pit draw...

Start be cleaning connections and testing voltages

Dont think. Verify oil pressure with a mechanical gauge

I would just swap core plugs and run it until you need a rebuild

Primer bulb is not allowed on an I/O Stop throwing parts at boat. Not sure why you changed the carb Look at the ignition system. Have you serviced the points?

Take the drive to a retired OMC tech and pay him/her

Punch your serial number into one of the many parts websites and look

When I board my boat, I normally turn the phone off

The bonding wire on the fuel fill keeps you from blowing up when you fuel up by preventing static discharge

not going to state what I think his rocket looks like. that guy has a serious Oedipus complex