Honda CRF250R/X (2004–2007) High-Flow Cylinder Head Kit – Cylinder Works
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Honda CRF250R/X (2004–2007) High-Flow Cylinder Head Kit – Cylinder Works Description Unleash race-winning flow — the Cylinder Works CH1003-K01 (0930-0129) High-Flow Cylinder Head Kit is a bolt-on, USA-made performance head for 2004–2007 Honda CRF250R & CRF250X. Featuring C630 nickel-aluminum-bronze valve seats & guides, competition valve job, unshrouded combustion chamber, blended bowls, and shortened guides for high-lift cams — all with stock-shaped ports for seamless compatibility. Valves, springs, and lifters not included.
What’s Included
- New Replacement Cylinder Head (fully machined)
- Cam Caps & Cam Cap Bolts
- C630 Nickel/Aluminum/Bronze Valve Seats & Guides (pre-installed)
Key Features
- Competition valve job — max airflow, instant throttle response
- Unshrouded combustion chamber — improved flame travel, more power
- Blended bowl-to-port transition — smoother flow, higher RPM ceiling
- Shortened valve guides — supports high-lift cams without binding
- Stock port shape — plug-and-play with OEM intake/exhaust
- Made in the USA — pro-level precision, race-proven durability
Fitment Fits the following models and years:
- 2004–2007 Honda CRF250R
- 2004–2006 Honda CRF250X
Warranty Info Backed by Cylinder Works limited warranty. Professional installation required. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
SKU: 0930-0129 / CH1003-K01
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
