1 maybe
2. NO
3. 4-strokes are heavy as phuck
A 12 foot boat is supper supper small. As in 1 person and a dog small. Plus it's narrow, so you need to move weight around as you found out
Your 710# rating is for people and motor and gear and fuel and beer.
9.8 tohatsu is 83#
3 gallon fuel...
usually the high-stressed fasteners for the bow eye, stern eye and the engine mounting are 316 condition B
Standard 18-8 or 304 or 316 are generally not strong enough
Standard grade 2 nuts are stronger than stainless
the boats from Minnesota where the 4 seasons are Nearly Winter, Winter, Still Winter, and bad sledding. it probably spent most of its time in the garage waiting for the ice to thaw.
bayliners generally are not fishing boats. they are a get wet and sit in the sun with a bucket of suds boat.
you may have to custom make a mount for the bow of your boat.
again. there are no o-rings.
the only supplier that has seals for the trim cylinders is fivestar marine
https://five-star-marine.myshopify.com/
Please do not start multiple threads on the same topic
no need to remove the lower
pump water into the hose from the raw water pump and push it thru the motor for a bit. catch everything that comes out the idle relief ports and the drive exhaust
then switch the pump to the inlet side of the raw water pump and push backwards thru the PS cooler...
its a generic plastic bimini top fitting. most likely from Attwood (another brunswick company)
measure your bimini top tube. its either 7/8, 1" or 1-1/8"
https://www.google.com/search?client=firefox-b-1-d&q=attwood+marine+bimini+top+fittings
I would find the issue and fix it before using the boat. the open deck, iron head and aluminum block mean that the motor will spit its head gasket with a mild overheat. and on that motor, 190 is too hot.