Vertex 810585 Top End Gasket Kit — Suzuki DRZ400 DR-Z4S KFX400 DVX400 Standard Bore

VERTEX — 810585 Top End Gasket Kit Premium Standard Bore Cylinder Engine Rebuild Set with Coated Stainless Steel Head Gaskets and High-Performance Oil Seals for Suzuki DR-Z400, LT-Z400, Kawasaki KFX400, KLX400, and Arctic Cat DVX 400 — Gray Base (Single Kit)

When you are tearing down your high-performance four-stroke power plant for a fresh piston swap, top-end refresh, or cylinder maintenance, sealing the combustion chamber perfectly is critical to extracting maximum compression and preventing destructive fluid cross-contamination. The VERTEX 810585 Top End Gasket Kit Standard Bore Gasket Kit - Arctic Cat/Kawasaki/Suzuki is a professional-grade mechanical sealing system engineered specifically to handle the intense thermal stresses and extreme cylinder pressures of today’s advanced engines. Precision-engineered to replace your factory seals exactly, this comprehensive standard-bore overhaul package provides ultimate reliability for garage mechanics and elite racers looking to drop in a fresh top-end configuration with absolute confidence.

The engineering centerpiece of this high-performance kit is the multi-layer coated stainless steel head gasket setup. Traditional low-grade composite head gaskets are prone to blowing out under high operating temperatures or aggressive timing curves; Vertex utilizes advanced, premium-treated stainless steel that maintains a consistent structural boundary between your water jackets, oil ports, and the combustion cylinder. To complement this rugged design, the kit integrates high-performance oil seals outfitted with high-chromium-content stainless steel alloy tension springs. This specialised metallurgy delivers superior sealing lip tension while offering unmatched corrosion resistance, ensuring that oil stays contained even during long-term exposure to harsh engine chemicals and moisture.

This master top-end maintenance bundle includes every critical sealing component necessary to fully reconstruct your top-end assembly from the base up. Inside the package, you will find top-tier head and base gaskets, intake manifold seals, exhaust crush gaskets, upper head components, and vital valve stem or power valve sealing accents depending on your configuration. This makes it the absolute ideal, cost-effective alternative to sourcing loose individual OEM parts when executing a top-end rebuild, restoring tight factory tolerances, stopping compression loss, and eliminating oil weeping along your cylinder deck lines.

Proudly manufactured in the USA, Vertex kits are respected worldwide for their premium structural uniformity and flawless fitment guidelines. This highly versatile model number boasts a vast cross-platform fitment list across multiple powersports genres. It delivers flawless sealing compatibility across the full Suzuki DR-Z 400 motorcycle timeline (including the classic S, SM, E variants, and the latest modern 2025 DR-Z4S / DR-Z4SM platforms), the Suzuki LT-Z400 QuadSport ATV generations, the Kawasaki KFX400 sport quad, the Kawasaki KLX400 series, and the sport-tuned Arctic Cat DVX 400 sport ATVs. Engineered explicitly for standard bore diameters, this kit ensures a drop-in match with factory or standard-size aftermarket piston crowns.

• Coated Stainless Steel Head Gasket: Features premium multi-layer stainless steel architecture with high-tech thermal coatings to guarantee a leak-free high-compression cylinder seal.
• High-Chromium Alloy Spring Seals: Integrated internal oil seals utilize high-chromium stainless steel springs for elite corrosion protection and consistent lip sealing pressure.
• Complete Upper Rebuild Package: Outfitted with all mandatory head gaskets, base gaskets, intake rings, exhaust crushed gaskets, and upper head component seals required for a top-end swap.
• Exact OEM Dimensional Matching: Every single profile is stamped to mirror factory original equipment dimensions exactly, eliminating fluid port blockages and alignment issues.
• Standard Bore Specificity: Tailored with precise inner-ring diameters optimized for stock-size cylinder walls and standard-diameter performance piston rings.
• American-Made Quality Control: 100% sourced, engineered, and manufactured in the USA using top-tier structural materials to ensure maximum racing life and flawless trail dependability.

Moto-House MX Pro Tip:

Whether you are restoring compression on a hard-ridden DR-Z400 dual-sport or swapping a piston on a high-revving LT-Z400 quad, a top-end rebuild is only as good as its gasket seal. Reusing an old multi-layer steel gasket or applying cheap silicone sealant around cylinder bases will lead to coolant leaks and lost power. Upgrading to an American-made Vertex kit ensures your top end handles high heat cycles and stays bone-dry. Installation Pro-Tip: Take your time cleaning the mating surfaces of both the crankcase deck and the cylinder head. Use an aluminum-safe scraper to remove any microscopic factory material from old seals without scratching the soft metal. Spray down the surfaces with a high-quality contact cleaner to strip away oils before dropping the new gaskets into position. Torque Sequence Note: Always tighten your cylinder head bolts in the progressive, star-shaped crossover sequence outlined in your factory service manual. Stainless steel gaskets rely on uniform compression across the entire surface to squash correctly—skipping the torque wrench or overtightening one side can warp the head plate or pinch the composite layer, leading to premature gasket failure.

Gasket Kit Architecture Spec	Material & Mechanical Tech	Chassis & Engine Fitment
Top End Cylinder Rebuild Focus	Multi-Layer Coated Stainless Steel Head Gasket	Suzuki DR-Z400 / S / SM / E & 2025 DR-Z4S/4SM
Standard Bore Layout Configuration	High-Chromium Stainless Alloy Seal Springs	Suzuki LT-Z400 QuadSport & Kawasaki KFX400 ATV
Intake, Exhaust, & Base Boundaries Included	100% Stamped and Engineered in the USA	Kawasaki KLX400 Series & Arctic Cat DVX 400

FAQ Questions

Q) Does this kit include a piston or wrist pin bearing inside the box?
A) No. This is a dedicated Top End Gasket Kit that contains all the structural gaskets, seals, and O-rings required to finish the top-end top assembly. The replacement piston, rings, wrist pins, and clips must be purchased separately.

Can I use this 810585 gasket kit if my cylinder has been bored out over stock size?
A) This specific kit is designed strictly for standard-bore cylinders. If your engine has a big-bore kit installed, the standard head gasket inner diameter will overlap into the combustion path; you will need to source a big-bore specific Vertex gasket kit instead.

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