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then buy a boat with an outboard OMC means Obsolete Marine Company - OMC went out of business many decades ago the buyer is lying. no way the motor has 0 hours being that old. typical use of a boat motor is about 20-50 hours a year. however OMC was in many low end boats that did not have...

Start with basics. What is the compression? Can the spark jump the 8mm gap as indicated above? Has the flywheel key sheared? If all above is good, only thing left is fuel system (carb, fuel pump, etc)

Do you have an automotive machine shop? If not, go outboard

What diagnostic steps have you done, or have you just thrown parts at it?

You have been lucky

Have too many friends abd family members that got burned. Dont do it If you need to make extra money with your house, start a hobby and sell things on etsy or ebay Not worth the 6-10 months of courts to evict people (even deadbeat relatives)

use an impact driver if you screwed it too tight and damaged the slot.

welcome aboard ebay

acetone will seep thru cracks in castings that water doesnt at room temperature. that is why acetone is used.

without the tilt quadrant, the motor should just be against the intermediate and with some force, someone should be able to lift the drive unless something else is binding. could be the lower pins binding could be the true-course parts are binding could be the OP is underestimating the force...

no, your new transducer will have new wiring. simply pull out the old wiring with the old transducer and use that to pull a section of cord thru. then use the cord to pull the new transducer wiring thru.

why ? you state it has a rebuilt motor

3/4" BCX plywood, a tube of tite bond III, cut 2 pcs of wood to match transom, laminate together with the tite bond III, then paint the wood with the old timers wood formula (do a search on iboats) then install.

first welcome aboard second, that boat will take a lot of work to make seaworthy. generally free boats are the most expensive.

1" above the water line in a static situation quickly becomes 1" below the water line with any wave or you walking about the boat.

Start with the basics Look at the schematic for your newer volvo motors. You either have a key switch issue, or a diode issue

40 grit minimum. I use 24 grit

here is the listing for 1967-1969 https://www.oldmercs.com/category_s/862.htm

3.9 hp single cylinder. 1964-1966 https://www.oldmercs.com/category_s/841.htm

bet there was an ER visit in the past?