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????----There are TWO grommets in there !----One for each poppit valve.----One shown in the picture for clarity.----And quantity 2 required in the part listing.

Make sure the cover is clean and FLAT.----All aluminum castings warp with time.

Also replace the 2 rubber grommets in there.---A very thin coat of a gasket sealer ( Permatex ) is all that is required.----Many folks use way too much.-----Dry is better than RTV oozing out.

The " UP " operation requires more current.----More work is being done.

A " brand new " looking sparkplug means ----No fuel.--Too much fuel.-----No spark ----or no compression.

Do you hold the key pressed in while cranking it over ?--Have you tested operation of the electric primer valve ?-----The bulb is a manual fuel pump.----Only used to fill carburetors.----Once motor has been cranked or run , the bulb does NOT need to be hard.-----Start with posting the actual...

Is that plug thread stripped out ?

Just a few tests.----Start motor let it idle.----Remove 1 plug wire at a time.----Post results.----Does spark jump a gap of 3/8" on each lead ?---Mark flywheel for TDC for each cylinder.----Use timing light to check each cylinder at idle.-----At full throttle on the lake look into each bore with...

Most people buying new vehicles are not concerned with complexity of repairs.-----They simply trade in for new again.-----Those of us who buy used vehicles say ----" what are those engineers / developers smoking "

Flywheel magnet checked ?-----Recheck all wires from switch boxes to the coils.-----Sounds like it is running on 4 of 6 cylinders.

Your location ?

???----In reverse there would be lots of exhaust in the water and thus less load !

I think some of those used a solenoid for the " trim up " function.

Plastic pulleys do not get rid of heat like a metal one.----Plastic parts are cheap and cheap to produce.

Did the bolts come out ?

Essentially it is revving because there is NO load on the prop !

When it is on a hose or trimmed out of the water there is NO LOAD on the prop.-----It will bark and roar on 3 of 6 cylinders.------Checked reed valves ?----Perhaps pistons are not installed correctly ??

On a fresh water motor they usually come out no problem.----Done more than one 67 tear old motor.-----Pouring boiling water over the block/cylinder head area will heat the area of the threads.---Expands the aluminum and releases the grip.

Your location ?

A 1995 control box can be used on a 73 model.----A 73 control box can be used on a 1995 model.----No modification needed if it has the big red plug !