Yamaha Genuine Bearing 6904 Camshaft Bearing 93306-904Y2 for Mio Sporty
Yamaha Genuine 6904 camshaft bearing for selected Yamaha motorcycles using OEM part number 93306-904Y2. This is an open-type, single-row deep-groove ball bearing intended to support smooth camshaft rotation.
Also searched as cam bearing, camshaft ball bearing, bearing 6904, bearing 61904, or Mio Sporty engine bearing.
Product specifications
- Brand: Yamaha Genuine Parts
- Yamaha part number: 93306-904Y2
- Bearing marking: NTN 2J-6904CS13
- Standard bearing size: 6904
- ISO equivalent number: 61904
- Inner diameter: 20 mm
- Outer diameter: 37 mm
- Width/thickness: 9 mm
- Bearing type: Single-row deep-groove ball bearing
- Closure: Open type—no rubber seals or metal shields
- Material: Bearing steel
- Application: Camshaft support bearing
- Quantity: 1 piece
- Country marking: Made in Japan
Available size
- 6904 / 61904
- Dimensions: 20 × 37 × 9 mm
- One OEM specification per listing
Primary fitment
- Yamaha Mio Sporty
The same part number may appear on selected Yamaha Mio Soul, Fino, Nouvo/Neo 115 and related carbureted models. Compatibility varies by model year and engine version, so confirm 93306-904Y2 through the parts catalogue or compare the removed bearing before ordering.
Equivalent size by bearing brand
| Brand | Dimensionally equivalent open-bearing number |
|---|---|
| NTN | 6904 / OEM marking 2J-6904CS13 |
| NSK | 6904 |
| Koyo/JTEKT | 6904 |
| Nachi | 6904 |
| SKF | 61904 |
| FAG | 61904 |
| Timken | 61904 |
These references share the basic 20 × 37 × 9 mm dimensions. However, the Yamaha-supplied CS13 suffix may indicate an application-specific internal specification. For an exact replacement, use 93306-904Y2 or match the complete bearing marking.
Important seal-type reminder
- 6904 or 61904: Open bearing
- 6904Z: One metal shield
- 6904ZZ or 61904-2Z: Two metal shields
- 6904-2RS, 6904LLU or 61904-2RS: Two rubber seals
Shielded and sealed versions may have the same dimensions but are not automatically equivalent to the open OEM camshaft bearing.
Package inclusion
- 1 × Yamaha Camshaft Bearing 93306-904Y2
- Camshaft, seals, cylinder-head components and installation tools are not included.
Installation reminder
Check the bearing number and dimensions before checkout. Bearing installation requires proper alignment and suitable tools; avoid applying installation force through the balls. Professional engine installation is recommended.