Thanks for responding.
I'm going to purchase the Thruxtons, then go back to the 42's and start all over.
I did have a good set up with the 42's except for occasional back firing through the carbies when giving a rev while stationary - even with a hot engine. All the mechanics I questioned said my pilot were undersized - and they were right! The 45 cured everyting, except to where I am now - rich throughout! like I said, I wish there was a size BETWEEN 42 and 45.
Will try the Thruxton needles and do it all again with 42's.
YOU will probably have a win with the TBS. ALL engines are DIFFERENT, and here where I am it is always bloody hot - thin air etc.
GOOD LUCK.
