When I bought my BMW F800ST, I thought I had found a sport-tourer with a clean, low-maintenance belt final-drive. Soon afterward my local BMW dealer lost the franchise, and the nearest dealer was suddenly 200-plus miles away. Now I maintain the bike myself using the CD shop manual; however, measuring belt tension requires a special tool whose function I can't duplicate. I tightened the belt once while cold, but when the final drive reached operating temperature, the belt seemed too tight, so I backed it off. I am fairly satisfied with the current setting, but would prefer some definitive means for getting the correct tension. With all the belt-drive bikes out there, is there a general rule for setting belt tension?