Vertex OEM Replica Cast Top End Piston Kit VTK24212 — KTM / Husqvarna / Gas Gas 85cc 2018-2025

Vertex OEM Replica Cast Top End Piston Kit VTK24212 — KTM / Husqvarna / Gas Gas 85cc 2018-2025

Product Description

Restore factory-level compression and power to your mini racer with the Vertex OEM Replica Cast Top End Piston Kit. As the trusted OEM supplier for 2-stroke pistons in modern KTM, Husqvarna, and Gas Gas machines, Vertex delivers exact-spec performance for 85cc engines. Whether you are prepping for a full season of racing or just performing routine maintenance, this kit provides every critical component required to rebuild your top end correctly.

Manufactured from a gravity-cast aluminum alloy featuring an 18% silicone content, this piston is incredibly light while maintaining structural rigidity under high RPM loads. Each unit undergoes a rigorous T-5 hardening and tempering cycle, paired with molybdenum disulfide-coated skirts to reduce friction and accelerate the break-in process. Vertex also produces this kit in standard A, B, and C sizing, allowing you to match the piston precisely to your cylinder's bore wear.

Top Features: Vertex Top End Piston Kit
o Exact OEM replacement for KTM, Husqvarna, and Gas Gas 2-stroke engines
o Gravity-cast aluminum alloy construction with 18% silicone content for high heat resistance
o T-5 hardening and tempering heat cycle prevents thermal expansion distortion
o Molybdenum disulfide-coated piston skirts reduce friction and break-in time
o Comprehensive kit includes piston, OEM-spec rings, wrist pin, circlips, wrist pin bearing, and top-end gaskets

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: What size piston do I need: A, B, or C?
A: The "A" size is standard for a brand-new cylinder. As your cylinder naturally wears, you step up to a "B" and eventually a "C" piston to maintain tight, factory-spec piston-to-cylinder wall clearances. If your cylinder has hours on it, you should measure the bore with a micrometer before ordering.

Q: Does this kit include everything needed for a top-end rebuild?
A: Yes, this is a complete top-end kit. It includes the piston, piston rings, wrist pin, circlips, a complete top-end gasket kit (base gasket, head o-rings, exhaust gasket), and a new wrist pin bearing.

Expert Pro-Tip: Always check your ring end gap by squaring the ring in the cylinder bore before installation. Even with top-tier cast pistons like Vertex, manufacturing tolerances stack. Additionally, pay close attention to the A, B, and C sizing. If your cylinder has over 40-50 hours on it, dropping a standard "A" piston in might leave you with too much piston-to-wall clearance, leading to premature skirt wear and piston slap. Size up to a B or C appropriately based on your actual bore measurements.

Recommended Pairings:
o KTM 85 SX Performance Parts & Upgrades
o Husqvarna TC 85 Performance Parts
o Gas Gas MC 85 Performance Parts

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. Every order ships fast from our Central Florida location.

Moto-House MX – Choice of Champions – Clermont / Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.