Maybe soaking the valves in some sort of super cleaner would soften the buildup. That looks about normal I think for an engine with those hours on it. Ned may chime in and he knows whole bunches more then most of us about these engines. (2 to 3 oz's isnt much)
Happy New Years!
This has been a very helpful thread for us newish 530 owners.
2003 DR 650.(1976 Montesa 250 Enduro-nice!) - - 1990 MASI TEAM-3V.- 1976 Motobecane, Super-Mirage.- Kona, HumuHumuNukuNukuApua'a. Single Speed ThRaShEr BiKe. 1968 360 Greeves challenger MXer. 1999 Triumph Trophy 1200. 2011 KTM530 EXC. 2012 KONA Hei Hei Deluxe (ongoing bike issues) -2009 KTM 200XC-W.