Alternator belt chirp

[pawork]

Replaced my alternator belt this weekend as preventative maintenance (6 yrs on old one). Basically attempted to match tightness of old one. Runs fine, but I now have a slight chirp the first time or two I accelerate hard (and only when I accelerate hard) when bike is cold, like belt slips a bit, but then this goes away within a couple of minutes. Anyone else run into this?

[PGlaves]

Replaced my alternator belt this weekend as preventative maintenance (6 yrs on old one). Basically attempted to match tightness of old one. Runs fine, but I now have a slight chirp the first time or two I accelerate hard (and only when I accelerate hard) when bike is cold, like belt slips a bit, but then this goes away within a couple of minutes. Anyone else run into this?

The belt is probably a little bit too loose. If the chirp doesn't bother you a lot - then a little too loose is better than too tight in my opinion. Loose slips the belt a little and it chirps until the alternator catches up. Tight damages the alternator front bearing.

I think they are perfect when they chirp once on cold startup but don't chirp at all while underway, even cold.

[pawork]

Thanks for the input - I was guessing same thing. Will check when I do valve adjustment in a couple k miles. But the chirp is only on the first throttle twist or two. After that, no sound. Meanwhile, will keep on riding. In the SE USA, October is good.