Quick question:

Can one tell by the sound if the valves need to be adjusted?  My (friend's) bike seems louder, but I haven't ridden it in awhile.  It has 5900 miles on it.

Thanks!

P.S. I just ordered the Clymer manual today.  

Yes, but I'd have to hear it in person. And since you're in Ohio maybe someone around there can listen to it? Or, take it to a motorcycle mechanic.

Valves should be checked every 4000 miles.

Yes, I saw that the schedule says the valves should be checked every 4000 miles.     I can barely get the owner to change his oil on time.     Once my manual shows up I'll get in there to check.