I'm trying to bring a 70s era Schwinn Continental back to life - so far I've sprung for new tires, new rear wheel, trued the front wheel, adjusted the brakes, given it a bath and cleaned/lubed the drive train. It weighs a ton but it goes like a train once you're rolling... unfortunately in the top gear the chain skips with even moderate pedal pressure.

So here's the question - what do I do next? It doesn't make sense to put too much money into this bike, but I would like it to work! FYI it's a 14 - 28 5 speed freewheel.

Thanks in advance...

JM