Kawasaki KX125 03–07 54mm Stock Bore Cylinder Kit – Athena
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:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
