Yamaha AG125 Inlet & Exhaust Valve Pair – 1JP 26/22mm
Brand-new unbranded replacement inlet and exhaust engine-valve pair for compatible Yamaha models 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 |
|---|---|---|
| AG125 | 2017–2019 and 2023 OEM catalogues directly verified | OEM Yamaha valve diagrams list 1JP-E2111-00 and 1JP-E2121-00 |
Important Fitment Information
Direct Yamaha OEM part-number match on the verified AG125 catalogues. Compare the original valves on other market years.
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.