Carburetors are a mechanical component of an engine. They are responsible for delivering a metered amount of air and fuel supply to an engine to sustain proper engine operation.
Making any carburetor adjustment has become a thing of the past. Over the years, carburetors have evolved and have become a fundamental part of emissions control. Most carburetors made after 1995 no longer feature mixture adjustments because of emissions compliance. This design simplifies production and ensures tuning or adjustments are not necessary, and keeps the engine compliant.
Current carburetors feature fixed jets which are specifically calibrated to an engine family and application. This style does not require any type of carburetor adjustment.
If you have an older engine that does have mixture adjustments, we recommend reviewing the appropriate service manual for that engine family. The manual will give specific instruction on how to adjust the carburetor properly.