Builder, using muratic acid used to be the "trick" years ago when working on two stroke dirt bike motors. I remember repairing a Hodaka 90 that had been run on straight gas and seized apiston(the kid said it was runing real good right before it quit)LOL! I knocked the piston out used a qtip with muratic acid to eat the alum off the steel sleeve in the cylinder, cleaned up the piston with sandpaper, a new set of rings and top end gaskets and Here you go kid break it again!
