lost a piece of piston...Stumped?

look at the end gap of the top ring is it me
or something look weird???

the cylinder bore little scratch as we can call them doesnt affraid me much,little honing will do the job as I can see

new cam and 8 pistons later with rings will do the job!!

the cranck seem to be ok

you can get KB 190 for less than 400$
Doug herbert selling cam for pretty chip so...
http://www.dougherbert.com/index.php?main_page=index&cPath=83_84_85_623