Kawasaki KX125 03–07 54mm Stock Bore Cylinder Kit – Athena (2003-2007)
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Rebuild your KX125 2-stroke with race-proven precision. Bolt-on replacement with upgraded nickel-carbide coating, high-flow power valves, and Cast-Lite piston—no machining required.
The Athena P400250100001 is a complete 54mm stock bore race cylinder kit for 2003–2007 Kawasaki KX125. Features nickel-carbide coated aluminum cylinder with larger water jackets, hard-anodized power valves (non-OEM), removable bronze dome cylinder head for adjustable compression, and Cast-Lite flat-top piston kit with Athena gasket set.
What's Included
- 54mm Nickel-Carbide Cylinder – larger water jackets, optimized cooling
- Aluminum Cylinder Head – removable bronze dome, adjustable compression, anti-detonation design
- Hard-Anodized Power Valves – high-performance, non-OEM (OEM valves not compatible)
- Cast-Lite Flat-Top Piston Kit – rings, pin, clips
- Athena Top-End Gasket Set – head/base gaskets, seals, hardware
Key Features
- 54mm stock bore — OEM replacement displacement (125cc)
- Nickel-carbide coating — extreme durability, low friction
- Larger water jackets — superior cooling under race load
- Hard-anodized power valves — faster response, longer life
- Removable bronze dome — adjustable compression ratio
- Cast-Lite piston — lightweight, high-strength
- Made in Italy — race-proven precision
Fitment
- 2003–2005 Kawasaki KX125
- 2006–2007 Kawasaki KX 125
Install Notes
- Bolt-on install — no machining required
- Must use included power valves (OEM valves not compatible)
- Intermediate skill level — top-end rebuild experience recommended
- Jetting adjustment may be required
📦 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.
