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There is more to it , like condition of motor.----Post the compression numbers here first.

Launch the boat.----Start it up.-----Let it warm up.----Adjust as needed.

Correct.

Prop it for WOT of 5500 RPM

I doubt it was the rubber parts.-----I think rust from crankshaft jammed the drive shaft in the crank.----A very common thing on motors that get little or no loving care !!

This was 10 years ago.------Doubt JR will reply !

I doubt it will flex from just opening the throttle plate.----But you have you wonder why a mekanic resorted to that fix.

I know of quite a few " GREW " boats that had water logged foam.------I just drive by chuckling when I see one at the end of a driveway.

They are a wonderful / simple / reliable / all you ever need motor.-----But if somebody get into with a big hammer and crowbar all bets are off.

Fancy carpet and upholstery hides a lot of things.------I would not venture out in a " GREW " without inspecting the floatation foam under the floor.---

Use 50:1 in this motor.---Bearings need lots of OIL to set up the " hydrodynamic wedge "-----That is what keeps the metal bits from touching.------Examples of a hydrodynamic wedge are a boat up on plane.-----Boat is the " bearing " and water is the lubricant.------A water skier also needs that...

Someone made a rod from a piece of 1/4" threaded rod.----Clearly visible in first picture.----I am not sure why it is bent at the carburetor end.

Is this a 2 stroke or 4 stroke motor.----Need model # or picture.----There is a fuse on a 2 stroke.----That fuse if blown won't stop a running motor.

Install a new impeller and test run.-----Post picture of old impeller.

That rod is not from the factory.

Best to do a compression test and take the boat for a spin on the lake.

Yes ,even new gear oil has that smell.----High sulfur content in gear oil.

Likely solved the issue 9 years ago !!!

Quite possible that this boat had a " dockbuster " on it at one time.----Those had a left hand prop !

Turn flywheel over and look for 2 notches on bottom edge.----They will be 180 degrees apart.----I have never seen one of these flywheels that did not have the 2 marks !!