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Is the place your doing the plug chop flat. The best info comes from a hard pull a hill climb is a good thing coasting is not.

If so take off your filters and make sure the slides are going all the way up on both sides. The power jet kicks in at 98 to 100 percent throttle. Also make sure they are even at wide open throttle. Looking at your plugs ngk recommends color on top 3 threads. I only see color on 1 this would mean your plug is too cold of a heat range br7es would be better for your bike also the first 1/2 mm of the electrode should be shiny which means your engine is too retarded. If you plan on advancing the timing now is the time so you don't have to start over with jetting. There is no sign of transfer of aluminum at the base of the plug so I see no signs of ping or detonation. I would advance 3 to 4 deg.

I use a digital caliper for measuring, harbor freight one will do. Until you main is correct make sure your needle is in the middle it is the last circuit you tune. My Procedure is to set idol Circuit first making sure that it is not too fat or too lean in the bottom and second I just the top end because the mid range is a combination of the idle circuit in the top and circuit Does your carburetor have a power jet on it on the top on the back? They usually have a hose going from the bowl to that jet.

Change it, run it, but keep a close eye on it. Probably water pump seals but could just be condensation. You'll be able to tell real fast with fresh oil.