At between 5 n 6000 rpm my headlamps
flick on n off or go dim then bright, recently replaced burt out rectifier now have this fault.Any ideas where to look now?

Suspect earthing problem. Check earth strappings to headlights.

or the loom earth?? could be bad

weak spark??

or the bike earth?? (should be good else you cant start??)

Check Battery earth (should be good to)

whats the battery voltage when engine running??

Tks

Cheers chaps will investigate
tom n let you know.. Full time
job these kit cars

All sorted thanks for ideas
they led me to a loose feed wire
to the headlight relay..Many thanks

Till next time