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The bearing is shown as a separate piece.-------So use your grinder , weaken it and remove it from the shaft.-------And have a very good look at your gears considering that bearing was shot !!!

That is why the poster should put up serial # or pictures.----I agree a 1991 inline 6 might be rare in North America.

Well----1990 might have been the first year for slow on them.----Trouble shoot the cooling system first.

Would it have anything to do with the fact that at the bottom of the piston stroke the crankcase is open to the exhaust housing ?

Pressure test the gearcase.

Warm it up with a wee propane torch and it will fall off !

Force power-----Do you understand why these 2 strokes sneeze when set too lean on idle mixture ?

That is why when an engine is " flooded " there is too much fuel in the air mix.----Even though there is spark it simply will not ignite.------

You could start learning by searching for -----LEL gasoline-----Using google.

Hard to say what was done without pictures.-----What is maximum HP rating for the boat.-----Sounds like the entire motor was replaced.

The ---" lean sneeze " ---in outboards is not well understood.

Time to pull it apart for inspection.

If throttle plate is open slightly at idle the motor will do the " lean sneeze " thing.----Check throttle plate timing.

Not possible to have a 90 degree looper powerhead inside a 60 degree 175 HP cowling.----Powerhead to exhaust housing gaskets appear to be different as well.----Any pictures ????

I have a number of NOS Chrysler sets.------No carburetor kits.---Your location ?

You have a 1991 model inline 6 cylinder ?------Serial # is ?----Your location ?

Often referred to as a lean sneeze.-----Open low speed mixture screw 1/8th turn at a time.-----And it could be that throttle plate opens too early.

I will look at my leisure and see if I have a NOS gasket set with that head gasket.

Post pictures of old head gasket.

Open low speed mixture screws 1/4 turn each.----Test run.-----Repeat if need be.