Transmission Mainshaft Gear
This component belongs to the transmission assembly and mounts on the mainshaft. Honda identifies it specifically as the gear serving the third- and fourth-gear positions rather than as a single-ratio gear.
Honda · Genuine OEM Part
Honda part 23451-MKR-D10 is a genuine transmission gear identified by Honda as GEAR, MAINSHAFT THIRD & FOURTH (20T/23T). It is a combined third- and fourth-gear component installed on the transmission mainshaft.
The gear carries two specified tooth counts, 20 teeth and 23 teeth, corresponding to the third- and fourth-gear positions identified in Honda's catalog description. Its catalog quantity is one piece. The exact Honda part number should be used when ordering so the named gear and tooth arrangement are matched correctly.
This component belongs to the transmission assembly and mounts on the mainshaft. Honda identifies it specifically as the gear serving the third- and fourth-gear positions rather than as a single-ratio gear.
Those tooth counts are part of the official Honda description and distinguish this component from other transmission gears.
The Honda catalog identifies this component by part number 23451-MKR-D10 and by its third-and-fourth mainshaft designation. Matching both details helps prevent confusion with nearby gears in the transmission assembly.
Honda's transmission parts catalog places 23451-MKR-D10 among the mainshaft and countershaft gears. The catalog names it as the third-and-fourth mainshaft gear and specifies 20T/23T, while surrounding entries identify other gears by different shaft locations and tooth counts. This establishes the part's role and distinguishes it from adjacent transmission components.
| Honda Part Number | 23451-MKR-D10 |
|---|---|
| Honda Catalog Description | GEAR, MAINSHAFT THIRD & FOURTH(20T/23T) |
| OEM Catalog Description | GEAR, MAINSHAFT THIRD & FOURTH (20T/23T) |
| Part Type | Gear |
| Assembly | Transmission |
| Tooth counts | 20 teeth / 23 teeth |
| Catalog quantity | 1 |
| Model | Type | Model Years |
|---|---|---|
| CBR1000SP | Motorcycle | 2021–2023 |
Model applications as listed in Honda's dealer parts catalog for part number 23451-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.