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Post results of a compression test.----Actual numbers.-----Or remove cylinder head and inspect cylinder walls.----Head gasket is cheap.

The question is ---Does spark jump a gap of 5/16"?----Sparkplugs are not mentioned.----Sparkplugs are not involved in this test.----The parts books seem to show a roller on the follower.----Perhaps the carburetor is not original.

And most shops are reluctant to do major repairs on 4 strokes.

There are few standards set for sturdiness / quality of the structure.-----Most buyers only look at cosmetics and convenience items.

5750 RPM is maximum

Correct.-----Nothing wrong with the needle.-----Does spark jump a gap of 5/16" on both leads ?-----Post actual compression values here.----I have more than 1 of these wonderful 6 HP motors.-----I can not see or touch yours.----You have to answer questions.

I do not see a picture of the tip of the slow speed needle !-----Look under EXHAUST HOUSING for the parts.

Picture of the tip of the slow speed mixture needle?

A 1976 motor would not be prop rated.----Your location in Ontario?

Start the motor.----Remove plug wires one at a time.----Report what happens.

Check for water in one or more cylinders.

Start the motor.----Then push key in.-----Motor RPM should drop / change.----Does it ?

What is your 85 HP motor doing / not doing ??

In my opinion it was designed ( in a hurry ) to compete with the hot selling OMC 3 cylinder motors of that era.

A new factory key, or hardware store item?

What bore size is marked on the " smaller " 1983 carburetors?

Checked the flywheel key??

Spark maximum advance is set for life of the motor.----Normally needs no adjustment.----Make sure it is correct.

Not a robust lower unit for a 70 HP.----And 2 carburetors for 3 cylinders.----Not on my list of favorite motors.

Should be 6 numbers for a part #