Originally Posted by helivaguy

try this..
its how i set all my .21 nova and rb engines.
HSN=3/4-1 turn in from flush.
MID speed (brass) =flush.
LSN=2 turns out( counting turns out with slide barrel closed ) or 4 turns out with slide barrel open.

plugs i use with byrons gen2 20% fuel= odonell 100,novarossi 6,mccoy mc8,rb 6.