Change gearing now tons of detonation

Ok well i switched back from variated ciao to single speed pully ciao

So i just took it out for a spin in single speed mode and tons of detonation's on the bottom end and mid range. the plug is still showing chocolate brown but with dark black from the detonation. Do i need to rejet or what its not making any sense and it was tuned when it was variated.

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