Need help on where to start looking for this problem. Was riding my 02 660 Raptor and shifted from first to second in a slide and heard a pop from the engine/gearbox. It continued to run but had this loud tapping noise. it still starts every time with that tapping , I loaded it right away to prevent any more damage . Where should i start looking first. The last owner said he installed a new piston and rings before i got it . So what do ya think?