Servo Motor Function
This assembly is identified as the motor for an exhaust butterfly valve servo. It provides the powered actuation used by the exhaust-valve control mechanism rather than serving as a cable, guide, cover, or mounting fastener.
Honda · Genuine OEM Part
The Honda MOTOR ASSY., SERVO is the motor assembly listed in Honda's Servo Motor section.
Its documented service function is the exhaust butterfly valve servo motor. It operates with the associated exhaust-valve cable components to provide motorized actuation within the exhaust-valve control mechanism.
This assembly is identified as the motor for an exhaust butterfly valve servo. It provides the powered actuation used by the exhaust-valve control mechanism rather than serving as a cable, guide, cover, or mounting fastener.
The same catalog section separately identifies the exhaust-valve cables and valve-guide cover associated with the motor assembly.
The exact Honda part number and catalog description identify this component as a complete servo motor assembly. Matching both details helps distinguish the motor assembly from the related cables and hardware shown in the same section.
Honda's parts catalog groups this motor assembly with two exhaust-valve cable components, a valve-guide cover, and the related mounting hardware. These details establish the component's role within the servo motor assembly without assigning specifications that Honda does not publish for this part.
| Honda Part Number | 31420-MKR-D11 |
|---|---|
| Honda Catalog Description | MOTOR ASSY., SERVO |
| Part Type | Servo Motor Assembly |
| Assembly | Servo Motor |
| Required quantity | 1 |
| Described service function | Motor, exhaust butterfly valve servo |
| Model | Type | Model Years |
|---|---|---|
| CBR1000SP | Motorcycle | 2021–2023 |
Model applications as listed in Honda's dealer parts catalog for part number 31420-MKR-D11.
Verify the Honda OEM part number for your specific model before ordering.

Compatible motorcycles, ATVs & side-by-sides
Verify your vehicle's model, year and specific configuration before ordering.