Pulled the airbox and carbs

[Blastr2783]

All the GS petcocks are vacuum actuated. Your bike must be an "L" model? As far as I know, only the '80 L models had the screwdriver operated petcock. It does have two positions, On and PRIme. However, people have been replacing them with aftermarket petcocks. Question: is yours leaking and overfilling the carbs? Could be you have it on prime. Screwdriver slot vertical is PRIme, horizontal is On or Run. You might just have it in the wrong position. If you do replace it, make sure you get the right bolt spacing, it's different than the ones with a handle on them.

The tank seems to be off a 1980 bike but the bike is a 81 and I was hoping a petcock with a handle would be a diect replacement, dang it!