I managed to snap the chain on my moped, 1977 motobecane 50v. I believe it was from this chain of events:
-I broke and then replaced the pulley on the moped (this piece - http://www.1977mopeds.com/Motobecane-Stock-Pulley-p/50120.htm).
-While / after repairing the pulley, the chain must've been too loose, and it popped off while riding.
-I adjusted the position of my back wheel (brought it back by a small amount) so that the chain wouldn't pop off again, and after ~2 miles of riding the chain snapped.
My thought is that moving the tire back made the chain too tight, and for that reason it snapped. I did not hit anything while riding at the time of the chain snapping.
My question is - should I be looking into any specific chain for the 1977 motobecane v50, or will a google search for 'moped chain' bring up a bunch of results that will all fit on my moped? I counted the number of links on the chain and it was 54 if i counted correctly, although I'm not sure if I lost any links of the chain when it snapped.
Thanks in advance,