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The butterfly has some effect on the fuel signal not just by control the air coming into the carburetor but its direction. Some carburetor builder points the backside of the butterfly toward the low side circuit to improve signal and draw more fuel while others focus on positioning the butterfly for optima flow at wide-open throttle.
Bore Diameter .625”
The Carburetor Throttle Shutter fits most Clone Carburetors including the Tillotson PK-1, Hyuai, Ruixing, and SP Carburetors on the Honda GX200, Ducar 196, Ducar/Tillotson 212E, Tillotson 196R/RS, Tillotson 212R, Ducar/Tillotson 212E, Predator 212 and BSP 196 and 212 Engines.
AKRA 2020 Rules for Throttle Butterfly
Butterfly .037” thickness. Butterfly screw minimum length .305”, the screw must remain stock as produced with no alteration allowed to achieve min length
NKA 2020 Rules for Throttle Butterfly
The butterfly is .037” min thickness; butterfly screws minimum length 0.305”.