We are headed down to the same general area end of the month. Hoping to get down to Barranca Tolantongo. But more likely Xilitla (if the boys keep slicing off days). Already marked the danger seep on the map. 4 miles west of El Naranjo. Check. We have those snot slick crossings in Texas, too. End up riding every part of the bike but the seat if you're not careful.