The attachment below is what your plug should look like on a properly running /tuned GY6.
What you need to do is get a fresh plug, put it in and then go on a top speed run. Then pull the plug again and take another shot.
Now..all that said, this is not what is causing your issues that you mentioned.
When we first modded ours, we used the yellow clutch arm springs and found that we didn't need the thing revving THAT high for take off. What we found was that just the sliders in the front and the yellow main in the rear were a perfect combo. A lot of times, the clutch mods are really designed for the guys running in very hilly type terrain. Seems to me you said that this is not what you really do. Is that correct?
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