Not mine,
https://seattle.craigslist.org/see/mpo/d/seattle-yamaha-rd350-parts/7360046636.html (https://seattle.craigslist.org/see/mpo/d/seattle-yamaha-rd350-parts/7360046636.html)
He's asking $75 for a pair of cylinders or a cylinder and a head. Go get 'em, or one of us can help.
Oooo... maybe a good backup?