engine rebuild

I’ve got a 1998 thunderbird sport 900. I’m replacing a few things and rebuilding the engine but the main thing is replacing the crank shaft. A tooth broke off that’s why the bike is mine now. TBird and TBS - what’s the difference? Are the engines the same? Say I find a crank shaft for a 98...

I’ve been gifted a T bird 900 1998 from by best friend. It’s been sitting for a year. Im currently letting the rusted alternator bolts soak in penetrating oil. The gear on the right side of the crank shaft has a broken tooth. I’m stripping the bike down to clean and to remove the engine. I’ll be...