TwinLewi
XS650 Addict
I do mark my plugs and observe how they end up installed, but I don't add any extra shim or indexing washers. Very rarely do I get one that installs with the side strap towards the intake and masking the spark. If I do, I'll simply try it on the other cylinder and it often works OK there.
I also label my plugs "R" and "L" so I know which cylinder they came out of.
is this pic after a clean? Or just after you pulled them? Running a bit hot maybe? Just trying to learn.