I would like to know how far in the needle valve assembly should protrude into the carb ventury. Ther is quite a large range available by screwing in the assembly and locking it with the external locknut. I have been looking at some other of my engines and they vary... Is there a general guideline for this adjustment, or are all carbs different?
Thanks,
Johnny Matwing pirate:

Open the carb full throttle and look down through the hole at the
needle spray bar. It should protrude into the opening just under half way.