I have done mine twice since i had the Yamaha TDM since 2005 and they have to be done every 24K,I let a dealer do mine first of all but they charged £140 for just doing the valves.It dont take long to get to the valves,its when you find out which ones you need and cant get to a dealer (cause of no other transport)and its Saturday so when you phone them up for the parts they might not get to you till Tuesday:-( So last time i done them it was on a Friday evening then went and got the shims Saturday and had the bike up and running Saturday late afternoon :-)
ps when you got the cam cover off take a few Moby pics of the cams showing the timing marks etc help when putting it back together, also get a strong magnet eg one of those telescopic ones for hard to reach nuts and put that on top of the bucket,when you pull out the bucket the shim should be stuck to it underneath,still got to be carefull though but lessens the risk of the shim dropping down into the engine.
