Overview Reviews Similar Products –> Product Description Notes: Must be replaced as an assembly; cannot order the stepper motor separately. These mixer assemblies are specific to the serial number of the generator. When a generator struggles to run smoothly at different loads or hesitates during operation, the problem often starts at the point where fuel and air mix before combustion. The Generac 0L6775 Mixer Assembly w/ Stepper 20kW Evolution Air Cooled Generators restores the proper blend, helping the engine respond consistently and reliably. A worn or failing mixer can make the generator stumble, idle unevenly, or feel unpredictable when power demands change. A mixer assembly combines fuel with air, enabling the engine to burn efficiently and maintain steady performance. The stepper motor moves small internal components to adjust the mixture as the generator speeds up or slows down. On Evolution series units, the mixer and stepper come as a singl
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