[NZCOBRA]

Run a smaller plug gap , if they are carbon fouled you can heat them up with small butane torch , (hope you have good electronic ignition and coil ) set gap , if you have got the carbs right , go for a good thrash as the chambers will be full of carbon , then fit new plugs , I have got some jet type listing in a book for weber carbs , let me know what size engine and street or race , I will see if something is close . Cheers .