Can anybody please tell me where the  idle fuel/air mixture screw is on the GS 500 ?

What Year , and where abouts in essex are ya?

Hiya
      its a 1997 Eu & I,m in Sible Hedingham Essex (approx 10 mile from braintree)
cheers John

Ah kool , Im from Southend., bout a hours ride away 

dont surpose you would fancy havin a look at me bike then LOL

Im pretty good with most of it , but i bought my bike rejetted , so i havent touched that bit yet , 

Ah ok then
Cheers john

First off, none of these pics are mine, they are all "copied" from earlier threads here:







As the carbs come from the factory (at least in the US) there is a thinnish brass plug pressed into the "turret" over the screw head to keep citizens of the Land of the Free from messing with it. If that's in place, you'll have to take the carbs out and carefully drill a hole in the plug to remove it.