My Squeaky Kymco

[smalbany]

Need some armchair advice. My 2003 Bet & Win 250 with 1,400 km has developed a squeak that I hear at low speed coming from the drive train when I accelerate and then back-off the throttle or just rolling at low speed without any throttle. While I only hear at low speed, I suspect the sound is masked at higher speed by other noise. Maintenance is up to date. Do the belt or the pulleys tend to loosen over-time? How do you adjust the tension? Scoot is still under warranty but the closest dealer is some distance--should I be concerned a drive train component has gone bad?
Thanks.
Smalbany

[John]

Have 05 250 B&W. It also has a low speed squeek. Beco International in Canada informs me it is the speedo cable. Need to disconnect at top and lub it to eliminate squeek.