Honda · Genuine OEM Part
Honda 23421-MKR-D10 is a countershaft first gear listed in the transmission assembly. As a transmission gear, it engages with its corresponding mating gear to transmit power through the selected first-gear ratio. The catalogue places this gear at reference number 4, helping distinguish it from the other countershaft gears listed in the same assembly.
This part belongs to the transmission assembly and is identified specifically as the first countershaft gear. The exact Honda part number helps separate it from nearby mainshaft and countershaft gears when ordering service parts.
Honda’s transmission fiche lists part 23421-MKR-D10 as reference number 4 and names it GEAR, COUNTERSHAFT FIRST(34T). The surrounding entries identify other transmission gears by shaft and gear position, while the related parts diagram independently labels the same number as GEAR, COUNTERSHAFT FIRST (34T).
| Honda Part Number | 23421-MKR-D10 |
|---|---|
| Honda Catalog Description | GEAR, COUNTERSHAFT FIRST (34T) |
| OEM Catalog Description | GEAR, COUNTERSHAFT FIRST(34T) |
| Part Type | Gear |
| Assembly | Transmission |
| Tooth count | 34T |
| Catalogue reference number | 4 |
| Model | Type | Model Years |
|---|---|---|
| CBR1000SP | Motorcycle | 2021–2023 |
Model applications as listed in Honda's dealer parts catalog for part number 23421-MKR-D10.
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.
