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Looks like a old style livewell timer

As stated no t-stats and passage will not crude up. A small stick is of no use as a mouse can climb thru the passageway as its so large..

Sorry but you need to have a different dream :)!! If there was no oil in fuel the other pistons/cylinders would show signs of siezing and scuffing. What you have is pre-ignition damage. 0

Install the tell-tell nozzle as it acts as a restrictor...could be too much water overboard.

How is impeller failing? vanes ? hub?

If you Google "Pennzoil Premium synthetic in yamaha hpdi" you may find you mechanic is misinformed.

I see this when impeller start to harden..I would change inpeller first.

Go to a synthetic oil and reduce smoke and fouling and use the CV85

Take that old 2 blade Merc prop off and install a 3 blade and raise the kicker to decrease drag on take off

Doubt it as designed as econo 50/1 motor

Make sure the crossbar linking L & R carbs together is correct as they will slip and cause carbs to be slightly cracked open on one side

In both post there is no H2O ejecting from water pump indicator... could be getting hot at low speed

Check the rubber coupler on fuel pump.

Most likely center failed before and was repaired but original problem which caused failure was not fixed..see it all the time in customers DIY repairs

That center piston doesnt look OEM...and its not a no oil problem

Normal

Mercury 2-4-C grease

High pressure pump run when key cycled?

Head needs to be surfaced.you can torque all day on a warped head and still wont pull it flat

Forget what I posted above as for different forum. If your getting water in bottom cylinders most likely the divider plate or power head gasket blown.