When to change sprocket and chain?

[cmepasu]

Hey All,

The 7,500 mile service on my 08' S is upon me. I'm curious if I should be changing out the chain and sprocket at the same time I do this service - or is it a "if it aint broke, don't fix it" kinda situation? I'm generally happy with my gearing (-1 up front) but the idea of doing a 520 conversion is appealing, just not sure if its going to be worth the $ beyond bling factor.

Also, figure its a good opportunity to install my new Nichols flywheel Any suggestions on further tinkering while the bike is apart??

Thanks much!