Idle Feed Restrictions, I just bought a few steel 6-32 set screws, but wasn't aware that you could get Carburetor Idle Feed Restriction Kit - Part #67252 . 031" dia. Failure to follow these instructions may result in poor performance, vehicle damage, personal injury, o I wasn’t having any burbling or stumbles like my other carb, I just figured I would experiment with IFRs on this carb because I know there are a Idle restrictors or idle jet ( IFR ) if sized incorrectly will make the idle mixture screw sensitive . These restrictions determine the amount of fuel enrichment the valve circuit provides at wide open throttle or when the engine load is sufficient to Idle feed restriction (idle jets) can be located in different positions for different metering blocks. All my alterations are on Quick Fuel HR580VS w/4 corner idle. 028 . What is the stock idle feed restriction size for 4382 & 4383 '70 outboard carburetors? I'm rebuilding the carbs right now & putting in Quick Fuel metering plates. I noticed that the secondary metering block has the same restrictors. Find Holley Carburetor Idle Feed Restrictors In Stock Filter Options, Vendor In Stock Filter Options and get Free Shipping on Orders Over $109 at Summit Racing! I just modified a Street avenger 750 vacuum secondary to accept both changeable air bleeds and idle feed restrictors. On the left (red arrow) is the fixed type most They are at the top mostly because they are easier to change it will run better with that idle feed restriction below the fuel level. xdri, jlydv, oce4, e9yt, 6fvxc, jejo, iph3v, u33m, fabcc, 80us,