Honda cbr 125 fi problems?

When in first second and third gear the bike keeps losing power, it feels like the clutch keeps engaging and disengaging, exactly like the bike is being whiskey throttled, the chain tension is fine and the clutch cable is properly adjusted, any ideas what it could be?

From your brief explanation, it appears that the clutch is slipping.
Probably needs a new clutch.
Get a second opinion from a qualified mechanic that can witness the symptom in person.

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