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The shim/s are used to adjust crankshaft end play or "float" as I like to call it. Due to casting and machining some blocks will need several and some none. As Racer stated if it didn't have any it doesnt need any unless it was previously disassembled. What made piston go bad?

No.... that video will cause someone to crap some gears. OMC housings are precision machined so the only setting you can adjust is pinion height. There is no shimming of forward and reverse gears so any backlash adjust is thru pinion height. Also there is no backlash spec as referred to in...

If sender is removed from tank that's likely your issue

The click you hear is when the air motor check valve releases the diaphragm and diaphragm returns to position to start new cycle....disconnect onboard tank wiring to eliminate float sender

Temp sender or t-stat stuck forcing it into S.L.O.W

Check valve is bad.. 22-8189941

I would clean the areas really good and fill/build area back with Devcon aluminum putty, the redrill and tap it.

You can test on trailer...just dont back it in too deep as need the prop to aerate a lil

Most likely stator or switchbox dropping under load..will show fine on a hose

Common problem

Here is my post on how to delete it.. http://www.marineengine.com/boat-forum/showthread.php?466153-1990-evinrude-120-water-control-valve-delete

I have found no matter the seller, if it has phillips head screws they are chininesem pumps. And you cannot interchange a OEM fuel pump rebuild kit as they dont fit. I had several customers do the conversion and all but one had problem with them.

Part# for needle is 396522 and kit is 396701. This needle and kit has been used since 1969 . Only other needles are the 387262 and 396522. Got a pic of needles?

90-861355 is correct manual... https://www.oldmercs.com/product_p/90-861355.htm

These are known for the sleeves to shift, thats why I pin them on a rebuild.

Only if the engine will turn over..if stuck walk away

They just push in with a socket and light pressure and you use black rtv the shiney kind

The lower part is the lower drain and the "T" is not OEM.

Go over to the Scream and Fly site, plenty of guys in Texas and OMC parts.

No....