Does anyone know what the weight difference, the actual physical weight difference in pounds, would be between 74 inch fly wheels and 80 inch fly wheels?

 

There shouldn't be any- they only change to the flywheels was center of crank pin hole location was moved outward .140", moving the stroke from 3 31/32" to 4 1/4".
Balance factor did change slightly.

 

3 different weights are in the mix early 80 inch are the same or close to 74 its the grunt thing but they changed them to equal thickness became lighter and then you have S&S equal thickness more lighter again and T&O has stock weight and super heavy = mud bogging i guess

light bike light wheels works - a tug boat needs the wheel barrows weight or your downshifting it all the time on hilly roads

 

Okay, good answer, thankyou.

 

Another good answer, thank you.