Hey norm... you are talking about the pagsta tank... i have one too... same problem you are having! I have a few ideas on my thread (click below)... I have a yamaha petcock on the way that i hope fits... my other ideas included an inline universal petcock or use a 14mm to 12mm spark plug adapter on the tank bung so i could use a 12mm petcock! P.s. I took off all my pretty red paint and turned it flat black!