Re: New Newb Big Time
You can easily adjust chain length by adding shims behind the rear motor mount block.
Just make the chain slightly long and shim till it's right. No tensioner required!
That said, I simply tack weld the tensioner to the frame stay for security on sale builds.
Much easier and still reliable.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.