Help need to adjust drive chain on '80 atc110

[ohballs]

Can anyone explain to me how I would adjust the drive chain (tighten) on a 1980 Honda atc110. I just bought this puppy, and need to tighten the chain, and don't want to have to take out links to do so.

I also do not understand how or why the back brake lever has anything to do with the chain, it appears to have an arm in back that puts additional tension on the chain from the brake lever?

Please help. Thanks!!

[traxxasx]

* should post this in the Trikesylvania section, * would already have lots of response there.