Yamaha YBR125 Inlet & Exhaust Valve Pair – 26/22mm
Brand-new unbranded replacement inlet and exhaust engine-valve pair for compatible Yamaha YBR125 engines using the 1JP / 5VL valve-reference family.
Valve Specifications
| Valve | Head Diameter | Stem Diameter | Overall Length | Yamaha Reference |
|---|---|---|---|---|
| Inlet / intake | 25.90–26.10 mm service specification | 4.975–4.990 mm | Approx. 64.2 mm | 1JP-E2111-00 / 5VL-E2111-00 |
| Exhaust | 21.90–22.10 mm service specification | 4.960–4.975 mm | Approx. 63.3 mm | 1JP-E2121-00 / 5VL-E2121-00 |
Yamaha's YBR125 service data specifies nominal 26 mm inlet and 22 mm exhaust heads with approximately 5 mm stems. Independent replacement-valve catalogues give approximately 64.2 mm inlet and 63.3 mm exhaust overall lengths.
Vehicle Compatibility
| Model | Verified Scope | Fitment Basis |
|---|---|---|
| Yamaha YBR125 | 2004–2026 documented catalogue family | Uses 1JP-E2111-00 / 1JP-E2121-00, superseding 5VL references across multiple YBR125E/ED/EGS/ESD variants |
Important Fitment Information
This listing is for YBR125 engines that use Yamaha inlet 1JP-E2111-00 (formerly 5VL-E2111-00) and exhaust 1JP-E2121-00 (formerly 5VL-E2121-00). The part-number family is a stronger fitment check than model year alone.
Yamaha reference numbers are supplied for fitment identification only. This is an unbranded aftermarket valve pair and is not represented as Genuine Yamaha.
Before installation, compare the original valve head diameter, stem diameter, overall length, keeper/collet groove and seating face. Cylinder-head condition, valve-guide clearance and valve-seat condition must also be checked.
What's Included
- 1 x inlet / intake valve
- 1 x exhaust valve
Installation
Correct valve seating, guide clearance, spring assembly, valve-clearance adjustment and cam timing are essential. Professional cylinder-head inspection and installation are recommended.