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Moving your post to the 4-stroke Forum for you. Please update with engine serial number for further assistance.

Thanks!

Temps sound normal.

For TESTING ONLY: Disconnect the connector from the ENGINE oil tank sensor. Jumper across the two wires on the HARNESS side: the horn should no longer sound if it's the...

Maintenance History? What fuel (and how old)?

The "Trophy" is the problem here more than any pitch question. Simply put- you can't purge the can and remove the water that's blocking the exhaust.

Try a 24 pitch Tempest Plus or POSSIBLY a 24P...

+1 to #4 and #5.

Have also seen poor grounds on the electrical plate (where it bolts to block, or where grounds connect to it) causing this type of problem.

Please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks! :beers:

Please- Don't copy portions...

You cannot test an FDV by "blowing through it". It's a DEMAND valve, so the way you test it is to place a DEMAND on the outlet side (providing low pressure or suction).

You stated the line was...

Please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks! :beers:

Run it FULL DOWN (verify clearance, may have to do on the water) and hold the trim DOWN for 4 seconds (stalling the trim motor DOWN). This will ADAPT the full down position.

If TRAILER LIMIT is...

Make sure it's going to handle 125a input just to be safe (you might also look at an alternator upgrade at some point, and need that extra capacity).

Vessel View LINK will not work with your phone. That would be Vessel View MOBILE.

Confirm which unit... because LINK is what works with your Lowrance units and NMEA-2000.

That 14 pin connector "can" be de-pinned, but it's a real PIA to do it.

That's MEGA hot for this engine. Don't continue running it.

I would be going back into the water pump FIRST before going any further. Failed or incorrect gasket or gasket orientation, or...

As indicated above, YOU are inducing faults and engine guardian. Never apply throttle unless your engine is IN THE WATER, IN GEAR, and GOING SOMEWHERE.

Very BAD idea.

I'm not buying "crankshaft sealing rings". Something (simple) is being overlooked.

Remove pressure hose from crankcase, use gearcase pressure tester (or bicycle pump) to...

The seal part is no big deal. Pulling the powerhead, and cleaning any remaining gasket material to permit a good seal can be labor intensive. You would need to get an estimate from the facility...

Since it will give higher priority to a "hot" bank, you can actually have a thermostat fault due to a sticking-open PORT thermostat, and be HOT on the Starboard side (even potentially overheating).

Yes, it "could" be, but your readings are really not conclusive using that type of gauge.

The ONLY reason you would need one would be to translate Digital Trim or Digital Fuel signals (where you had installed a digital trim sender, or a Fuel/Oil harness).

Perhaps a bearing had already failed, OR some debris ended up in a bearing, or between spacer and shims, resulting in too much preload on bearings.

^^^^^ This.

And "Ethanol Content" is actually the LAST criteria for fuel selection (NOT the first).

Not really that high-tech... you just need to inspect the reeds. And test/check the crankcase pressure check valve.

After checking the ignition items, check compression, fuel quality, pressure and delivery.

Fuel pressure gauge is the best way to determine if there's an elevated pressure problem.

You SHOULD have received a copy of the Platinum Contract (the original owner should have had it in his paperwork).

The following link provides information from Mercury's Website: ...

Only one.