Vertex Cast Replica Piston Kit (46.94mm) 24212A/B/C — KTM / Husqvarna / GasGas 85cc 2003-2024

Vertex Cast Replica Piston Kit (46.94mm) 24212A/B/C — KTM / Husqvarna / GasGas 85cc 2003-2024

Product Description

The Vertex Cast Replica Piston Kit is a technical top-end solution designed to restore compression and power profile consistency to high-RPM 85cc two-stroke engines. In standard motocross and off-road mini racing applications, thermal expansion and frictional wear decrease factory tolerances inside the cylinder bore over operational hours. This replacement kit refreshes internal combustion efficiency by replacing worn assemblies with precise factory architecture components.

Constructed utilizing a gravity-cast aluminum alloy matrix with an 18% silicone content, this component maintains strict thermal stability and resists crown deformation or structural fatigue better than non-silicone formulas. The assembly undergoes a specialized thermal T-5 hardening and tempering treatment process to withstand aggressive powerband variations, while the outer skirt surface is shielded with a targeted Molybdenum Disulphite compound to lower runtime friction parameters and establish rapid mechanical break-in. Sized to match standard 47.00 mm factory cylinder bores, this package is available in distinct incremental fractions (A: 46.94 mm, B: 46.95 mm, C: 46.96 mm) to match your specific Nikasil wear dimensions. Every box includes a single-ring configuration, optimized wrist pin, and dual retention circlips.

Top Features: Vertex Cast Replica Piston Kit

• Gravity-cast aluminum alloy structural compound optimized with an 18% silicone content to mitigate heat expansion and prevent cylinder scuffing.
• Thermal T-5 hardening treatment provides structural stabilization under intense racing heat and extreme high-RPM operations.
• Molybdenum Disulphite skirt coating minimizes localized drag, protects base cylinder plating, and reduces machine break-in duration.
• Incremental A, B, and C sizing options allow precise clearance matching for worn or aged factory Nikasil coatings.
• Comprehensive 2-stroke package includes the replacement cast piston, standard rings, wrist pin, and snap circlips.

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

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Sub-Model
2003-2024	KTM	85 SX (Standard / 17/14 / 19/16 Big Wheel)
2013-2014	KTM	85 SXS
2008-2009	KTM	85 XC
2014-2024	Husqvarna	TC85 (Standard / 17/14 / 19/16 Big Wheel)
2021-2024	Gas Gas	MC 85 (Standard / 17/14 / 19/16 Big Wheel)

Frequently Asked Questions

Q: What is the mechanical purpose of the A, B, and C size options?
A: Two-stroke cylinders lined with Nikasil plating wear down by micro-millimeters over extended use. An "A" piston matches brand new cylinders, while "B" and "C" options are slightly larger by 0.01 mm increments to compensate for cylinder material loss and restore critical running clearances without a full re-plate.

Q: Why use a high-silicone cast piston over a forged alternative on an 85cc engine?
A: Cast pistons with high silicone content exhibit minimal thermal expansion rates compared to forged pistons. This allows tighter cold-running clearances, minimizes the risk of cold-seizures during early warm-up cycles, and matches factory engine profiles.

Expert Pro-Tip: When performing a top-end refresh on Austrian 85cc platforms (KTM, Husqvarna, Gas Gas), always check your engine's "X-Dimension" by using a piece of solder wire across the piston crown and checking squish clearance against original guidelines. Adjust your cylinder base gasket thickness accordingly to hit the precise factory specifications. Additionally, ensure the exhaust ring locating pin faces toward the intake side during installation to avoid snagging a ring on the wide triple-port exhaust windows.

Recommended Pairings:

• KTM 85 SX Performance Parts & Upgrades
• Husqvarna TC 85 Performance Parts
• 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.

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