Rough running at high RPM

The big question mark are those 2-stroke spark plug caps.

The problem has been found by a helpful friend . On two plug caps the braided sheilding  continued down inside the cap,. As soon as he trimmed that back and made a better job screwing the leads into the caps ,all ran smoothly.

Thank you all again for your help.

Joe

Found shielding wire screwed into plug cap through too the inner wire on two plugs,

sorted and rpm drop 100a 120b at 4000

Happy chappie, carbs balanced through full range

mike