>>1715612BB and headset are usually the first things to take care of after you buy an older bike. That'll have an oldschool cup and cone square taper bb in it. Get a square taper crank puller and get those cranks off and take off the NDS cup and pull out the spindle. If the races on the spindle look ok then try repacking it, those old cup and cone bbs can last a very very long time if they're well maintained, but they die quickly if they aren't. If its badly pitted then a new cartridge bb is like $20 and easy to put in, assuming you can get the fixed cup off. You'll want a really really big wrench for that, and be careful which direction you turn it, that's going to have english threading so the fixed cup will be left handed. As far as the headset, it'll be either 1" threadedf or 1 1/8" threaded. Either way, common enough and you can replace if with a modern one if its badly pitted, but if it isn't then keep the one that's there. Repack the hubs, that's quick and easy in front, may be a bit tricky in back if that freewheel doesn't want to come off. My rec on getting the freewheel off to find the freewheel remover for whatever brand is on there, but get the good type that fits on a 1/2" socket wrench, and get a automotive breaker bar so you can get good leverage on it to get the freewheel off. A piece of metal pipe over the end of a normal wrench also works, but fuck that
