A possible reason for the "too loose" chain is when the gears at each end have come closer together, despite appearing like they're fixed at their axes; some bikes of mine in the past have had "adjustability" there.
Hmm. A good thing to check. Since this is a one-gear, pedal backwards to brake bike, that sounds like a way for someone to get the chain on and adjust back tightness. Thanks for the tip!
Check the bolts holding the rear axle. It slides into a slot -- that's what you use to adjust the chain tension.
With the bike on its back, loosen both bolts, just a little, then push back on the rear wheel until the chain is the way you want it. Tighten the bolts, making sure that the wheel stays centered.
Hmm. It's been a while since I had a bike, but IIRC, when the chain does that, the most likely thing is that the back wheel has shifted slightly. If that's the case, it's a fairly simple fix.
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With the bike on its back, loosen both bolts, just a little, then push back on the rear wheel until the chain is the way you want it. Tighten the bolts, making sure that the wheel stays centered.
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