Carburetor Question for FSTJACK

[mopower1958]

Jack on the Coronet I have a 9375 Dominator. In order to get a decent idle I have the throttle stop screws in over 6 rounds front and rear. The idle mixture screws seem to have little effect on the idle,should be 1/2 to 2 rounds out maximum is my understanding, and when its sits in neutral a while the idle creeps up till it gets to about 2200 rpm. It has 3 air bleeds per corner in the top of the main carb body. Do I need to increase the orifice size on the idle air bleeds in order to close the throttle plates further so as to utilize the mixture screws more effectively. If so, do you have a ballpark estimate on size, and are they the outside ones?

 

[newmexicoviper]

Im not fstjack but i have had several sets of carb's done by AED and you cant go wrong. The set i have now on my boat motor are 1300cfm each and they will idle, cruise or haul ass whatever you need them to do. They can get them dam near dialed in it will be just be a jet changing thing when you change elevations.

 

[mopower1958]

Thanks for the info, this is a new 9375 out of the box and the roller I have in it has very little vacuum signal. Jack is a retired carb guru and I thought he could point me in the right direction.

 

[FSTJACK]

Hey Man, You actually need to decrease the size of the idle air bleeds to get more fuel going through the idle circuits. You may (not a reccommended procedure) also have to drill the butterflys to get more air without throttle blade openong.

Try the idle airs first.

 

[mopower1958]

Thanks Jack I will try that.