The CA55-256L is 90 degree mixer for dual fuel mixer. Engineered for bi-fuel applications, this model features a movable air-valve assembly, thus providing additional air flow requirements of LPG Vapor or Natural Gas in gasoline bi-fuel applications. It is designed for use on engines up to 73hp (1 to 54kW), with a flow rate of 118 CFM (55.7 L/s). Impco, 1-7/8" Air Horn w/ Lifter

This is the rule of thumb we have used for years

LPG CARBURETOR ADJUSTMENT

Idle Mixture

Turning the idle air screw in will make the fuel mixture richer.
Turing the idle air screw out will make the fuel mixture leaner.

The idle air fuel mixture is best adjusted only with a engine CO exhaust analyzer and the mixture should be adjusted to 0.30 to 0.70 percent carbon monoxide.

Cross References

DWIMP-CA55-256L , IMP-CA55-256L, IMP-CA55-256L, IMPCA55-256L, SY58783, TY00591-14419-81