I just bought a GS and although I'm not a mechanic, I have enough mechanical knowledge to follow a Clymer manual and do some work myself.  Anyway, I took the gas tank off to inspect the top of the engine and carbs, and noticed something that I thought was strange.

For frame of reference, imagine yourself looking down on the carbs just as though you were sitting on the bike.

Between the carbs there is what I assume to be a fuel hose.  It attaches to the left carb, and is routed down between the carbs to somewhere, not sure where.  The potential problem I see is that when the throttle assembly between the carbs moves, it rubs the hose.  Is this normal?  Typically speaking hoses rubbing moving objects causes eventual wear through on the hose.  I already checked the manual and can't find a good pic to show me if it's right or not.

Any info you guys can provide is much appreciated!!  

That hose is the vacuum line to your On / RES / PRI fuel selector switch.  Vacuum pressure from that hose actuates a diapraghm in the switch, which allows fuel to flow to the carburetors in the ON and RES positions.  (In the PRI position the fuel is gravity-fed, so this vacuum is unneeded and ignored.)

I can't remember if my vacuum hose rubs or not.  I went out to check, but it looks like I would need to take the fuel tank off to get a good angle.  If you can reroute it - great.  If not, I wouldn't worry about it too much.

See if any of the pictures on my web page can help you:
http://www.angelfire.com/mt2/mikesgs500/rejetting/
I don't remember it rubbing against anything, but I may be wrong.

Thanks for your help.  It's always nice to get assistance from those with more experience.  I think I'll stick with the sound saying - If it ain't broke, don't fix it!   :lol:

Thanks!