That won't tell you anything. A rolller crank bearing as used in the GG has some detectable radial play when the flywheel is moved up and down, even on a brand new bike. A bad crank bearing will also cause more vibration and a roaring noise from the lower end. Remove the flywheel, if the seal is bad you will see evidence of it in a leak. If the flywheel side seal is bad, it will usually have lean symptoms from sucking air. This does not sound like your problem. If the primary seal is bad, it will smoke really bad, much worse than rich jetting.
Think simple at first. Check your float level, float valve, and overall carb condition, from what you describe it just sounds way too rich on top for some reason. Reeds next, and go through your electrical connections including the HV coil wire. I see by that pic the plug cap has been changed, perhaps an attempt to fix this problem and maybe not correctly. Check/clean the coil ground to the frame and the stator plate to the case. Lastly CDI and coil if you can swap with someone to troubleshoot.
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