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You replaced the plugs in a earlier post, did you not spray them with a protectant? Need to check temp alarm to see if functioning...

Mercury 2-4C grease

You take readings at battery

Should just be able to take a Allen wrench set and unscrew plug. Apply PTFE to last of sensor threads and screw in 3/4 of length, If fully inserted it will bottom out on steel mesh of filter giving alarm

Need to check voltage when running...if overcharging it will do this as internal parts overheat.

What the WMH number on carb?

As posted clean and rebuild carbs

Yer going backwards...need a block with exhaust hump.

A short shaft 50 is what ya need.

Rebuild the carbs.....

TPS= Throttle position sensor

I would go with the 70HP propped to ski/tube

IAC behind upper intake runner ..but why is a piece of plastic tie strap stuck in the TPS??????

Start your own post as this one is 11YEARS OLD!!!

If its a salty dog, just do a heavy decarbon on it and run it till it blows. 1977 should have the high ring pistons unless motor has been into. Too many V-4's laying around for pennies than waste coins on this dog. Also its only a 115hp at prop...

There is no pressure in VST housing..only on outlet to injectors. Ya really need to get a manual so you understand how it works before you try repair.

Leave it on trailer for testing

Filter on supply side lil to no pressure. Shrader valve is high pressure fuel pump.

Several things...stator,switchbox,rect/reg or fuel issues. First step is to check spark on both banks of cylinders when its acting up.