Re: 40 + mile ride today !!! what is the farthest you have gone ???
Air cooled engine simply do not overheat unless something else is wrong.
Jet it correctly (a tad rich) and it will run 24/7/365 without complaint.
I have ridden 10-12 hour rides with only fuel stops many, many times with no problems.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.