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optional idle air screw assembly to replace fixed jet

3K views 0 replies 1 participant last post by  kiwi-craig 
#1 ·
some of you have found quite perculiar jetting setups can be needed with bored carbs to get the idle circuit behaving.

this is linked to the fixed #100 idle air jet size not being "right" for the bored carbs jetting signals or what ever.

there have been suggested improvement by boring the air jet circuit and adding replaceable idle air jets. I did this on mine and it helped, down to #65 air jet and 38 pilot size to get things where they needed to be

next step in this it seems is to use the optional idle air screw setup

here are the details



FCR idle air screw

see table that equates turns out on idle air screw to idle air jet size



Sudco parts page

parts 30 A and 30 B



FCR exploded view

refer parts 129 and 130 plus note as optional parts to replace slow air jet part 30



would be pretty ease to tune with velocity stack early carb setups - screw would be out in the breeze !.

Walt, would sure appreciate your views / thoughts on this
 
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