what carb and what bike? 2 stroke or 4?
friend of mine went racing an MBA125 at Silverstone, saw him in the paddock said he wasn't going to bother as it wouldn't rev over 14K!!
when he got home he found the cables were the wrong way around, closing when should have been opening.
one problem Ive found on the BSA single or Triumph twin was that after standing over winter, the ethanol in the fuel had corroded the jets, the brass was green when stripped.
I know Steve at Piston Broke had a number of someone who strips and ultrasonic cleans carbs, Im in France at the moment so cant get to my tank.