I have some calls to Barnumspro about doing a "once and for all" the top-end rebuild that my local shop has failed at on this bike on multiple occasions. Is there other places that are recommended? (I'm in TN so I'd have to ship and deal with only by phone) OR I have a replacement head and cylinder now...just need valves and piston. Can I be instructed on how to assemble this 680 in a reliable bulletproof fashion? I know, I know...like asking how to do, DIY home surgery. I can assemble and turn wrenches and assemble parts with the best of them but I don't know the nuances of building a motor other than putting back together what I took apart? Can I be told the little things or should I just break down and pay the fee the 3rd time to rebuild it again for good? My local shop is the only motorcycle motor machine shop in town so even if I build it I'd have to either send out for machining or get him to do it. My thoughts: Fresh stock head...New SS Stock size valves ONLY with kibblewhite springs and retainers. (I don't know anything about measuring valve lash...or spring bind etc....?) 11:1 piston (will need to get notched because I only have stage 2 cam) Cylinder bored and plated to piston specs. The rod in the bike is stamped "made Japan" but I don't see any other manufacture or model on it. (it was replaced when I ran low on oil first rebuild) because I want bulletproof should I get a good quality one? My shop told me he couldn't balance the crank but that it didn't need it. If I do the work I'd like to have it balanced...where do I send it for that since my local shop doesn't do that? as well what parts...(counter balancer as well?) Putting it all back together...I can clay test if told the proper procedure and proper clay to use and clearances to look for?