Hi Everyone- I'm still quite new to airheads and was wondering what people recommended as general maintenance for my 89 R100GS. I am planning to lubricate splines, but I also heard that one should lubricate the swing arms as well. What lubricant would you recommend using? Secondly, when do most people have their transmission rebuilt? My transmission only has 34k miles on it; however, the bike has been sitting for over 20 years. Lastly, someone recommended upgrading & replacing the valve guides since the late 80s GS's had extra room for valves. Is this smart to do? Is there any other general maintenance that you would recommend doing on an airhead?