I got an old Honda 750-4 going by pouring Mystery Oil into all four cylinders and putting in a new battery.
VROOM!
I salvaged it out of my voice teacher’s back yard where it had sat for decades, obtained a Salvage Title, and got to work.
Cleaned up, it sold for $500.00.
Those were the days, my friend. I LOVE ICEs!
Years ago I had a brother going through a rough patch. T-boned in a car wreck his arm was broken so he couldn’t work. And his car was totaled so he needed another ride, as cheap as possible.
A friend of his gave him a car - a 1966 Lincoln Continental - that had been resting in the damp Pacific Northwest woods for over a decade. We dragged it out of the woods and I set to determining whether or not the beast could be rejuvenated.
I did the Marvel Mystery Oil trick down the holes to get the motor unstuck and got it running with not much more than a tune-up kit and a new water pump.
My brother drove the beast for about 18 months while recovering and building up a fresh head of steam. All it ever required was regular infusions of gas - lots of gas!
We used to recover junked outboards that had sunk in saltwater either at a dock or in the harbor and written off by insurance. We used fresh water, then isopropol alcohol followed by drying then a soak in a 55-gal drum of MMO to free the engine up. 1-3 months to get a new/used outboard engine. Most ocean-working ppl on the island had 3 or more outboards to swap when one had a problem.