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pontoons are they hydrodynamic equivalent of a brick they take a whole lot more hp than you think the speed to RPM is never linear, its a 4th order polynomial curve youre fine, go boating

US composites are good. I personally use FGCI with expanding foam, best to make small pours. the warmer it is, the faster it kicks

You IDLE speed is 650 RPM in water in gear. Out of water and in neutral, that is about 850rpm Where are the idle mix screws set?

I notice their website doesn't have a physical address listed and they are internet only

12-15

It's almost NEVER the thermostat and almost ALWAYS the impeller when there is an overheat

Sounds like the ESA switches need adjustment Get the factory manual, or at a minimum go to sterndrive.info and watched the videos for your stringer 800

You bought from from EBAY? And not a reputable fiberglass supply house?

Yes and no. First, yu need to tear the whole motor apart, measure everything, then machine everything Then after the machine work is done, buy parts However, finding a running motor would be cheaper I would worry about finding the exhaust manifold for a 2.3 before I spent any money on the...

And acetone

You need the Mercruiser fuel pressure checking fitting. It's about $45 Merc part number 91-18078 https://www.cpperformance.com/p-62701-fuel-fitting-connector-91-18078.aspx

Clean the crap out of the hull bottom, some 3M VHB tape to hold it in place L-shapped bracket attached to a bulkhead

Spacer for anti-rotation bracket on raw water pump?

Try finding a lower shift cable, or a factory shim pack. Good luck

you have a 1984 OMC stringer 400. the 1981-1984 only came in one flavor there were no 1985 stringers as the plant was torn apart for making cobras, just left over 1984's in a warehouse put into some 1985 boats you need the factory manual. only legal place to buy them...

I was referring bringing the coupler in to see what you can use. however if it was up to me, I would never have bought a yamaha drive.

without a HIN, its most likely stolen. the motor is a 1981-1984 OMC 3.0 / stringer 400

https://dmv.vermont.gov/faq/do-i-have-to-be-a-vermont-resident-to-register-a-vehicle-in-vermont google vermont loophole https://www.google.com/search?client=firefox-b-1-d&q=vermont+loophole

As Matt stated, Vermont would register it, then Texas wouldn't

As stated in the other post of yours, get a factory manual