Hello everyone hope everything is going good staying warm at least. I have a 1973TX 650 that needs a third gear so I have to split the case When I have the case apart. I thought I’d freshen things up. I don’t see a big bore kit. Or any rebuild kits. On any of the usual sites selling XS parts I talked to pandemonium and I would love to have him rebuild my motor.. in which it sounds like he does an awesome job but the funds for this project just aren’t there. however, I thought I could purchase a new, set of heads And make it a big bore kit and kind of do a rebuild. I haven’t tore it apart so I don’t know what the crank would be like. It has a little bit of smoke from the left side but nothing to complain about so I don’t think the motor is in bad shape. It has a good compression And starts on the first kick so I probably should just leave it alone but we know how that goes. And just change 3rd gear I am unable to find anybody around my house. That’ll do a valve job or bore the cylinder for me. so on the machining side I’m kind of stuck that’s why I thought I could buy a new set of heads. How hard would it be to put a later model set of heads on it? Plus they would look awesome , nice and new I’m sure somebody’s been in the same boat. Any advice would be appreciated. Merry Christmas and hope everybody gets a bunch of bike parts. Thanks again.