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Chain Tensioners?

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In my Cota 348 there's no kind of chain tensioner. However chain tensioners for 348 are available. Do I need a that one?

I have an early eighties 123 and it did not come with a tensioner either , it did however come with a wierd black plastic sleeve that the complete chain was routed through, it waded up into the sprocket the first day out, I do believe it needs something to help guide the chain or keep tension on it but I rode the bike for 20 plus years with out one and as long as I had the chain tension good there was no problemb, but let the chain get a little loose and it would derail, my advise if one is available, go ahead and install one

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