Chain possibly stretched.

[Rider2898]

I bought a 1981 Gs 750 EX as a midwinter as a cheap commuter/fixer-up project. Here the other day I adjusted the chain tension while the bike was on the center stand and the tire could spin freely. I adjusted the chain to the manuals specs, 20-30 mm of play. When I gave the tire a spin the chain would tighten then lossen. It would tighten to just under 2cm, enough to cause drag on the tire. Then it would lossen enough to have about 6 cm of play. I was reading another post with a similar problem. Is this much play enough to justify replacing the chain and sprocets, or should i just adjust the chain at its tightest point. I'm a college kid so money is kinda tight but safety is invaluable. Any input would be greatly appreciated. If anyone needs any more clarification feel free to ask. Thanks

[Greg O.]

Always adjust the chain at it's tightest point. Otherwise it will be to tight when it comes to the tight point. Sounds like the chain maybe nearing the end of its useful life. When replacing the chain the sprockets should also be replaced.

Greg

[tkent02]

When it gets tight and loose like that, the sprockets are past due for replacement.

[chef1366]

Also, take off your chain guard and make sure the chain is running straight from sprocket to sprocket. The rim might be off-center.

[Rider2898]

Thanks everybody you've all pretty much answered my questions