Take the lower unit apart.-----Inspect all pieces .----Inspect housings that hold / locate bearings.----Price parts / availability.------Perhaps start a search for a used lower unit.
Answer these.----What is your motor doing / not doing?----Do you have spark that jumps a gap of 5/16" , yes or no ?-----If you suspect 180 degrees out , then test by switching the wires.
????------This is a V-6 outboard powerhead.----Mounted as an inboard motor.------Mounted on top of a jet drive pump !!!-----It can not be tilted up and turned to fiddle with power tune or other potions !!
In the big picture a head gasket is cheap.-------Pull the head and have a look in there.----These engines live a tough life in the hands of joy riders.
When these engines left the factory there was a disc on top of the block with a serial #.-----Powerhead may have been swapped at some time.----Not going to happen , but if you walked over I could show you one of these 175 big bore crossflow engines !----Good luck with it.
The carburetion is so simple on this engine !!------Far simpler for you than the 12 volts and wires.------In good condition this is a wonderful motor , cheap to maintain.-----No $2000 ECU on it.
A lot of it depends on what type of hrs are on it.----Full throttle in smooth water , trolling in smooth water.----Trolling in big waves.----Full throttle in rough water.-----All make a difference.------Like buying a police vehicle with 100,000 miles on it and 2000 hrs of idling time.
It was clearly stated that this motor does not use 12 volts to produce spark at the plugs.----In fact this motor can be started with a dead battery.----Old time rope on the flywheel.
