I have a 2007 StreetGlide, when cold the drive belt is loose, but after about 20 miles the belt tightens up and starts making a whining noise. After cooling over night its back loose again. Whats Up?

 

As the sprockets heat up they expand pulling the belt tight in the process. Same thing happens with the primary chain. The slack settings are done cold to provide a not too tight condition when hot. Obviously following this logic through and things being temperature sensitive I try to set slacks in around the 70 degree mark. This will cover the colder days that you would ride and the hotter days. It's a compromise that seems to work well enough. If yours is whining when hot, it may not have enough slack when cold and gets too tight when it heats up.
Ron

 

Does anyone know why theFLHX drive belt is tighter than the otherFLH?

 

Because the rear shocks are shorter. As the swingarm pivots up, the belt gets tighter. With the shorter shocks, the swingarmis pivoted up more than the normal FLHs. The belt deflection specs on the lowered Dynas (FXDL and FXDB) and Softail (FLSTN) areless than thenormal models as well.