I posted about this in my thread about my bike in the Classics/Vintage forum, but it seems to have gotten lost in the shuffle. My apologies if this is a no-no, but I thought I'd ask here, too, as this is the first time I've really done my own repairs on a bike, and I'm having some problems I can't solve on my own.
The bike in question is a 1971 Hercules 3-speed with a Sturmey-Archer AW 3-speed hub, it was a freebie that was in unrideable condition when I got it, so last night I replaced the chain after doing everything else to get it rideable.
When I did a test ride on it, especially in 3rd gear, it will be fine for a few pedals, then will start skipping (feeling like I'm pedaling nothing, or taking a second of pedaling nothing to engage the chain). It will usually be OK in 1st or 2nd gear, but once I put it in 3rd, it's impossible to ride. I have a feeling my chain may be the wrong length. It droops a little bit at the bottom, but not too loosely. Should I adjust the rear wheel backwards so it will tighten the chain a bit? Take a link off the chain? Is it even a chain problem?
I hope I'm describing this correctly, but I can't ride this bike until I figure out what's going wrong, and I don't know if I can take it to my local bike shop without them wanting to charge me to figure it out...