Wondering if anyone has experimented with reduced opening/drilled shim sizes? Currently running truck-type gasket (reduced port size) and HAVE noticed range of choke spring reduced, but auto choke still works OK. How small can the opening be (for reduced charge temp.) and still have acceptable choke functioning? If spring range is too limited, achieving full open position when hot may not allow for enough cold choking to be useful?

6 VOLTS/POS. GRD. NW INDIANA