You definitely don't want to keep turning it--or even keep the prop nut tight--if you can "feel the balls" in the setup. At the least, as suggested, you need to find the problem, likely by fully disassembling, and fix it. If you haven't done this before you can read up on it and give it a try (but you might need to replace things) or find someone who has a good feel for this.
It could be garbage in the bearing, but if it is a new Enya that seems extremely unlikely to me. The ones I have seen are made like jewelry. It could be a bad installation, or the tolerances may have stacked the wrong way. Whatever it is, get it back out and you should have a very nice engine....
If the tip of the crank is damaged from hitting the pavement, that can brinell the front bearing because it takes all the impact load.
Good luck!