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Many of these 6 HP motor built in the 1970's will outlast the modern motors.

A very good precisely built gearcase.-----But these gearcases suffer from the fact that the driveshaft is used as a bearing surface.-----And since 1966 it has not been big enuff ( 0.432 ) in diameter.----The 54 to 65 cases had a shaft above the pinion that was 0.550" in diameter.

Use OMC / BRP product ----HI-VIS----Model # of your motor is ?----The older 6 HP have a totally different gearcase compared to the newer models.

Rare for the crankcases to leak.-----Unless the motor was molested by a wannabe mechanic.-----But maybe the bypass cover gaskets are leaking.----That would be an easy fix.----Post the actual compression test values here.----That will give the information you need.-----And it is a mistake to put...

I would say it is a choke plunger.----Be easy if I could see this motor.----But then again maybe your neighbor put that part in there for fun.----Post a picture with tape measure beside it so dimensions become clear.----Pictures more pictures.-----

Stop !!-----There are no pistons in the gearcase.-----So step #1 here is to post the actual compression values here.----Pressure test the gearcase to see if it is leaking.----Any water in the gear oil ?-----Gearcase is completely separate from the engine and piston rings have nothing to do with...

A 1959 ---1969----1979----1989----1999 model?-----Some details / model # and pictures will help you get worthwhile replies.

Maybe the carburetor was not the problem !----Test compression and test spark.-----Check valve clearance.

Piece of pipe and weld some key stock on it.----Or piece of pipe and grinder to leave 2 or 4 lugs.

Correct.----You cut those off.----Operation of the primer valve has been explained to you.

Post a picture of this motor.---Was the piece on the ground ?----Inside the cowling?-----How did this motor run for you last season ?

Part of the choke ???

Water in your test bucket must be 6" ABOVE the impeller.

I recall working on some small OMC outboards where plug gap had worn from 0.030" to 0.070"-------Means that motor / plugs were working fine up to that point.-----Many good sparkplugs are thrown out I think.

I see a new primer bulb for $82.75 and Sierra for $33.11.----This is for the primer for starting.----Not the primer bulb on the hose for filling the carburetor.

I can find the parts pictures with no issue.----Sounds like a bad check valve or dirt in the check valve.----Remove bulb from motor and try to flush it.-----Where are you looking for the parts ??

Supply and demand ??----When you are hot and thirsty you will pay $3.00 for 1 liter of water.-----At that price Canada should start selling the water in the 5 GREAT LAKES to the world.

Is a plug wire shorting to the cowling ?----Cowling does not suddenly need to let in more air after all these years I think.

I found those primer components in about 30 seconds for that serial #-----Do you understand what this little primer bulb does ??-----What is your motor doing / not doing ?

A 1986 model.