I did the flapper mod and removed the EVAP system (CA bike) on my RC last week, and plugged which lines I thought were necessary. Apparently I plugged a line to the gas tank that I shouldn't have, and the gas tank vacuum-crushed itself. The bike still ran, but I can't open the filler cap, and it looks like its been modded for stunting. Any ideas on how to fix it so I don't have to pony up for a new tank? Its a 2004 Hayden as well...DOH!!