Like I have said in the past, do NOT pay attention to the number of turns for the needle settings. The number of turns is ONLY A STARTING POINT!

Switch to a McCoy MC9 or Megatech Q-Series Offroad Plug. Both are cold plugs and will not cause your engine to detonate early. Destroyed plug coils and black plugs/piston tops do usually indicate hot/lean running conditions.

Once you get the new plug, Tune for peak RPM by richening your HSN (Counterclockwise). Turn in 1/8 increments. Make a highspeed pass on pavement. Then richen another 1/8 and repeat. If the rpms went up, repeat with another 1/8 and another run. Do this until you find the peak RPM that the engine will run. Then richen the mixture by 1/16 turn and go to work for a smooth idle and explosive acceleration by tuning your LSN.

Hope this helps you out.