Why do you think that you need a better carb?
I have ran almost a gallon and a half of fuel
through my Clockwork JL and have never had to touch
the idle screw. The Hi and Low speed screws
have only required very minor tweeks since the
first time the engine hit the starterbox wheel.
I own alot of nitro engines and the JL one of
the easiest to tune that I have ever owned.
I don't know and never asked Neal if he ever
pre-set the carb screws on this engine. I know
I told him I didn't need the carb modified for
venturi changes, so I don't think he did anything
to the carb. I do know that I told him that i'm very
happy with the JL and as with all my Clockwork
engines, It freakin screams.