KFX400 / LT-Z400 / DR-Z400 90mm Stock Bore Race Kit – Athena (2000-2016)
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- 30-day hassle-free returns
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Rebuild with factory-level performance—no machining required. Bolt-on stock bore kit with Factory Works porting, 12.2:1 piston, and race-proven durability for ATV, supermoto, or dual-sport builds.
The Athena P400510100001 is a complete 90mm stock bore race cylinder kit for 2000–2016 Kawasaki KFX400/KLX400, Suzuki LT-Z400/DR-Z400, and Arctic Cat DVX400. Features nickel-carbide cylinder with Factory Works porting, 12.2:1 forged domed piston, hard-anodized power valves, and full gasket set. Cylinder head not included.
What's Included
- 90mm Nickel-Carbide Cylinder – Factory Works porting
- Forged Domed Piston Kit – 12.2:1 compression, rings, pin, clips
- Hard-Anodized Power Valves – high-flow, non-OEM
- Athena Top-End Gasket Set – head/base gaskets, seals, hardware
Key Features
- 90mm stock bore — direct OEM replacement, no boring required
- Nickel-carbide plating — extreme durability, low friction
- Factory Works porting — max airflow, race-tuned performance
- 12.2:1 forged piston — aggressive mid-top power
- Hard-anodized power valves — faster response, longer life
- Made in Italy — pro-grade precision
Fitment
- 2003–2006 Kawasaki KFX400
- 2003–2006 Kawasaki KLX400 / KLX400R
- 2003–2014 Suzuki LT-Z400 QuadSport Z / LE / SE
- 2000–2016 Suzuki DR-Z400 (all variants)
- 2004–2008 Arctic Cat DVX400
Install Notes
- Reuses OEM cylinder head (not included)
- Bolt-on install — no machining required
- Advanced install — top-end rebuild experience recommended
- Jetting/fuel tuning may be required for optimal performance
📦 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.
