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These water pumps are simple.----There should be no need to replace parts multiple times !

???----You would have to swap the driveshaft.----OR it would be simple to swap the clutch dog and reverse gear.----But what if there is low oil pressure or shift piston is not moving correctly ???----Your location ?

You need to make sure everything is in order.----One plugged main jet and you could be doing the job over again.----After this epic struggle I doubt you want to do that.----Good luck with it.

Correction----Judging by paint color.----That might also be a 1987 to 1996 model 4 HP.---Sorry.----All the same impeller.

Not inspecting carburetors on a rebuilt motor is a mistake.----Torqued the flywheel ?----Checked the flywheel key ?

I have more than 10 of these motors on hand .---Water pumps are easy to maintain !!

Your reply in post #13 tells me I am a dummy to try and help you.

Good luck with you motor.

A 9.9 or 15 HP is the same pump.-----Has been the same pump from 1974 to 2005 or so.----Never an issue with them.

Is the water in your testing bucket 6 / 8" above the impeller, yes or no ?

I see damage on that impeller !!

I would not try to use a 1979 140 gearcase on a prop rated 175.----It might fit / work for a little while till it comes to a dynamic halt.

The 150 and 175 are a direct fit.-----Is yours a 20 " or 25" motor?"----Others motors will fit if you understand swapping driveshaft and shift rod.

Take the cylinder head off now.-----Lucky you if it is a blown head gasket.----There is no need to go 100:1 on a motor in good condition.----Bad idea !!

From 1991 to 2007 years.----And they must be the 60 degree looper.----Others may fit but may require driveshaft / shif rod swap.

Install a new impeller !

There you go again making assumpions based on poor information and reading.----It is NOT based on a 40 HP motor.-----And changing a carburetor does not turn a 25 into a 40 HP.-----Good luck with your endeavors !

You look at parts and automatically post that you think they are no good / poorly designed.----They built a lot of motors and those 25's are just wonderful !

Not much point in adding oil to the fuel !!-----This is a direct injected motor.-----Agreed , parts support for modern motors is pitiful.-----Too much outsourcing for parts.----Contracts for parts do not exist once shelf is bare.----Costs too much too make short parts runs.-----Easier to get...

Should be easy to find that part.-----Used for many years on many models.----Likely have many on hand here if you walked over.