I got this info from this site Open the primary chain inspection cover and check the chain. The chain adjuster hangs in the open below the primary for easy access. "It takes a 7/8-inch open-end wrench," and a 1/4 Allen and should be adjusted hot." The new Sportster manual called for 3/8 to 1/2 -inch cold and 1/4 to 3/8 inch slack while hot My manual calls for 5/8 to 7/8 -inch cold and 3/8to 5/8 inch slack while hot Metal expands when hot and contracts when cold, so I would think these measurements would be reversed. :17::17::17: Is my logic flawed or is this a mistake ?