# Cylinder Works 05-21 Yamaha YZ 125 125cc Standard Bore Cylinder Head

OEM-style cast aluminum replacement cylinder head comes complete with cam caps and bolts for an out-of-the-box, ready-to-go installation. The unshrouded combustion chamber is designed to improve airflow, featuring a blended bowl and competition-grade valve job.

-   Shortened valve guides accept high lift cams for greater torque and enhanced power
-   C630 nickel/aluminum valve seats and guides are easier on valve to reduce wear
-   Valves, springs, retainers and lifters are sold separately
-   Stock-shaped ports deliver high performance

## Details

- **Price:** 219.59 CAD
- **Vendor:** Cylinder Works
- **Type:** Cylinder Kits

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 219.59 CAD | In stock |

## Images

- Photo - Primary

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/cylinder-works-05-21-yamaha-yz-125-125cc-standard-bore-cylinder-head)
> Updated: 2026-08-17