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The units are different.-----And questions were not answered.

These 2 units shift different.------The 78 shifts to forward with an UP motion of the shift rod.----Model numbers of the 2 motors?----Do the shift rods look identical?

Agreed---It is 1-7/16"

How does it idle with some back pressure ???

????---Vapor separator was used on the 60 degree V-6 beginning in 91 and on the V-4 model 60 degree motors beginning in 95 model year.----Very common item !

Looks like the roller is missing the outer cover.----Roller is in the horse shoe shaped slot.

The hole just allows air / fuel mixture into the by pass area before going into the cylinder.----Direct charge was a " marketing term " to fool folks that direct charge was nearly equal to " loop charging " I believe.

Any auto parts store will find you that gasket.

Send it back to the vendor and get a good one.

What is the difference( if any ) between a crossflow piston and a " direct charge " piston ?

I believe the factory seals use a stainless metal casing.--Not all seals are stainless.----Proper bore interference fit as well.----I also dislike seals that are covered with rubber all over.

Test run with a portable tank and hose.

Myself I prefer using the original 2 seals back to back.-----This newer seal and installation is detailed / shown in many parts diagrams.----Say for a 2000 mode 50 HP 2 stroke.

The spring that is visible in post #1 faces the prop.----Simple as that.

Post the actual compression values here.

There is a crossflow 140 and a big looper V-4 model 140,-----Do NOT confuse ignition timing between the 2 models.

It used to be a 50 HP.----Now prop rated at 40HP.-----One of the best they marketed.-----Do a compression test.

A stack of tires and a 1 ton ( for your boat ) jack is all that is needed.-----Took a 30' boat off the trailer by myself that way.----No helpers / cranes needed.

Check oil in the drive.

Agreed----Clean carburetors / jets are very important on a 2 stroke.-----Clean them and post the results here.