Yep, when they sit for a long time with old oil in the crank & rod bearings, they absorb moisture slowly thru the air itself. This turns the oil into a mild pasty solution that doesn't lube anything, let alone bearings. Even in the old H-D Sportster 883cc engines with roller bearing cranks, those 2 pistons would not let me kick the engine over when someone did just that: my shop (sadly) sold H-D, too, and this was an every-Spring issue with H-D bikes being trucked in by frustrated owners (until the electric-start Sportsters changed all that). I had a mechanic who worked for me who was 200+ lbs (I am, still, 135 lbs) and he had to be the mad monkey to wrestle those back to life. SO stiff...