Hot Cams 8400009-1 Exhaust Valve Suzuki DR-Z400 LT-Z400 KFX400

Extreme Durability for High-Heat Exhaust Cycles

The exhaust valve is one of the most stressed components in your engine, constantly subjected to scorching gases and high-RPM vibration. The Hot Cams 8400009-1 Replacement Exhaust Valve, available at Moto-House MX, is engineered to thrive in these punishing conditions. This forged one-piece OEM replacement is designed to meet or exceed factory standards, providing a precision seal that restores lost power and ensures your 400cc engine runs as efficiently as the day it left the showroom.

Every Hot Cams valve is built with advanced metallurgy for long-term performance. This exhaust valve features a high-tech nitride coating that creates a low-friction surface to resist carbon buildup and heat-related wear. The valve stem tip is induction-hardened to prevent mushrooming under constant impact from the valve train, while the 29mm head is precision-machined to a 45° seat angle for an airtight seal. Compatible with your original valve keepers and retainers, this valve is the high-performance choice for any serious top-end rebuild.

Top Features: Hot Cams 8400009-1 Exhaust Valve

• Nitride Coated Steel: Advanced surface treatment provides superior hardness and heat resistance compared to standard steel valves.
• Forged One-Piece Construction: Maximizes structural integrity and prevents the valve head from separating under high thermal stress.
• Induction Hardened Stem Tip: Hardened to resist wear and pitting, ensuring consistent valve clearances over time.
• Precision Polished Surface: Reduces friction within the valve guide for smoother operation and reduced drag.
• OEM Standard Compatibility: Fully compatible with factory springs, retainers, and keepers for a direct-fit installation.

Expert Pro-Tip

When replacing an exhaust valve, always check the valve guide for excessive play; a worn guide will cause the new valve to seat incorrectly and fail prematurely.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2000-2024	Suzuki	DR-Z400 / S / SM / E
2003-2014	Suzuki	LT-Z400 QuadSport Z
2003-2006	Kawasaki	KFX400 / KLX400 / R / SR
2004-2008	Arctic Cat	DVX 400 / TS

Frequently Asked Questions

Q: Is this an intake or exhaust valve?
A: This part number (8400009-1) is specifically for the exhaust side. For the matching intake valve, look for part number 8400009-2.

Q: Do I need to cut my valve seats?
A: We highly recommend having a machine shop inspect and, if necessary, re-cut the valve seats to ensure the new 45° valve face seals perfectly.

Q: What material is this valve made of?
A: It is manufactured from high-grade forged steel with a protective nitride coating for enhanced durability.

Closing CTA: Ensure a perfect seal and maximum power. Buy the Hot Cams 8400009-1 Exhaust Valve now at Moto-House MX.

Stop by our local store in Montverde, FL or lightning-fast shipping across the USA.

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida.