Re: flywheel removal 2.5/200 merc
Having removed my 3rd flywheel I can tell you with authority of experience it is a PAIN IN THE @$$!. My motors are a 1974, 1963, and a 1958 Mark 75.
I used some KROIL penetrating oil, to assist in breaking them loose, and some sacrificial chickens, a shrine to Carl, and a bid of black arts......Use the right tool and follow the tips others have posted on here (sans the chickens and shrine but you will want the black arts)