Not mine,.. I just noticed these and thought they looked interesting (and expensive)
https://www.ebay.com/itm/Yamaha-TR3-350-CYLINDERS-and-HEADS-TZ350-TZ250-TD1-TD2-TD3-RD350-R5-VERY-NICE/153578867253?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D8920a8d978224777b9914d832d309287%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D153578867253%26itm%3D153578867253%26pg%3D2481888&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3Ad8ed22e6-ae5a-11e9-97e7-74dbd180e113%7Cparentrq%3A25e8615316c0abc1c9761846ffea8c4b%7Ciid%3A1