If you find a factory service manual, it will be for an 80 cubic inch (1340 cc) engine only. In 1991, all Big Twins came equipped with the 80 c.i. Evolution engine. The Twin Cam 88 c.i. (1450cc) engine didn't come out until 1999 in most of the Big Twin bikes and 2000 in the Softail bikes. Try this site for your manual. http://www.diyrepairmanuals.com/products.asp?cat=14142
Good Luck
Steve
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