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The service bulletin came out in 1994 to deal with the 3 cylinder 56 cube motors.------Many folks have gone overboard and applied this to every outboard !!

Water must be 8" above the impeller in a test bucket.

Where did you read / learn about ---" airlocking " ---on this turbojet ?

I used to sit at a launch ramp on weekends for entertainment.---50 years ago, no different today.

Fuel from tank goes to one pump.----Output from that pump goes to intake of second pump.----Output from second pump goes to carburetors.

The motor in post #1 is not a ---LOOP CHARGED ---motor.

Does your jet unit have a rubber impeller water pump ?

Contact ----brownspointmarine.-----Long time Suzuki place.

I know of a owner who used to run his 150 HP Mercury V-6 in his driveway.--Loved the sound of it.-----He was told repeatedly to use garden hose and muffs.----His reply was " I am only running it for 20 seconds or so , it won't over heat "

Timing on these motors generally does not change.-----Adjusting and hoping it will run better may well lead to expensive damage.----Best to do some trouble shooting to find out what is wrong.

I think it will.-----Read post #2 carefully

It is possible that previous owner ran it without water to impeller.----There are folks that simply do not know this fact.

Take starter apart for inspection and ohm check on armature.---Do not rush out and buy a new starter !!------Check battery cables.-----Slow cranking means you have weak spark.

Perhaps what is left over parts of the " shutter assembly "-----Sort of like a check valve to prevent water coming in the exhaust manifold.

Replace the reed valves.----It should then run like new.

I missed those numbers.----135 PSI ( 95 X14.7 ) is good compression.

Do a compression test before spending too much time or any EURO's on this motor.

Your motor uses the 18-3007 impeller.----And if you take the old impeller out you will likely read the part number on it.-----Ends with 83 if factory impeller !!!

use---google----mercruiserparts.com-----find your motor.------find part # for kits.-----google those part numbers.----done

??----Serial # is used to get the correct parts !-----And 98766 is a casting # and not a serial # at all.----Your location ?-----There must be a Mercury dealer that can help you !