Hey guys, first post on the forum. During the last 6 months, I've gotten into doing cosmetic restorations on vintage Seikos bought from Japan (5606, 6106, 6119, 7002, 7019 etc), as both a hobby and way to fund other watch purchases (college student). The problem is that to this point I've been limited primarily to cosmetic - cleaning, buffing, polishing, crystal replacements, etc. I feel like I've gotten very good at the cosmetic restoration, but I'm a total beginner troubleshooting movement problems. Most of the automatics I get from Japan are running flawlessly, but 10-20% have some seemingly minor issues - movement sticking and or lame power reserve (I don't actually know how to tell the difference). Sadly a $200+ service on a $40-$200 watch isn't feasible if I'm trying to resell it. I want to learn how to do basic services on these movements, but I don't know where to start. All the manuals stickied on this sub-forum are dead links.
For example, I have a 6106 and a 7019 that run beautifully after giving the rotor a good kickstart, but the movements stop after 20-30 mins, even on the wrist. I have no idea where to start. Any ideas or links to help me start learning? TIA