I got my hands on an 81 XS650H, I'm stoked! Few things to ask. Major Noob here, so I will apologize in advance for my Noobness. 1) he told me he was using Synthetic oil and would like to know if it is recommended to go back to organic. 2) pipes are shorty and stop right at the case. I get pops when down shifty and a little at idle. (leak in manifolds?) Maybe a bigger problem. 3) Chain is sloppy, will replace as well as sprocket, any recommendations on brands. 4) what should I also check to make sure I'm up to speed with any other maintenance for this motor. I can not tell you how excited I am about this bike. I have been looking for one, for what seems like, ever. I will get pictures of it on here today a little later. It is a bobber (sorta started) rat bike. it's kinda mickey moused in some areas, but all I see is the beautiful motor. The sound is unmistakable. Among the harleys and the endless supply of pro streets and knock off pro streets this truly, in my eyes, is the best bike out. Thanks to all for any help, and look forward to long Arizona road trips on it.