[quote=Caprimaniac;851974
Does anyone have any suggestion to what changes should be done to the IDF's jetting if the main venturis are changed to 41mm? Jac MAc?
[/QUOTE]
41mm multiplied by 4 = new main jet size reqd--164 ( 165 ) then your 190 air may need to go up to 200, but as you sound!!
like a bit of a racer 190 should be OK.