Thats an intelligent and novel idea!!
Sometimes the piston spring can be swapped out for different tensions to affect
mixture under acceleration at different altitudes; other times the needle
profile
can be changed to affect mixture settings at specific engine loads or rpm;
its not uncommon to see some really old guy playing with a watchmakers lathe
doctoring the factory OEM needle to perfection...
Get a copy of Phil Irvings book tuning for speed its the standard bible of
engine
tuning...
At the end of the day inlet manifold pressure, exhaust header temperature and
oil
pressure, an attentive ear and backside is all you need to monitor a motor;
everything else is ancillary and a bonus!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=503238#503238
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