Vertex Top End Piston Kit Size A - KTM 85 SX / GasGas MC 85 / Husqvarna TC 85 2018-2023 | VTK24212A-2

The Vertex Top End Piston Kit Size A (VTK24212A-2) is a precision-engineered replacement for the 2018–2023 KTM 85 SX and its Austrian platform siblings — the GasGas MC 85 and Husqvarna TC 85. Supplied in size A, this kit delivers exact bore fitment to maximize power, minimize blow-by, and restore your 85cc engine to race-ready condition.

What's Included

• Piston (size A)
• Piston rings
• Wrist pin
• Circlips

Key Features

• Size A Piston — Precision bore-matched for maximum power and minimal blow-by
• MoS2 Coated Skirts — Hi-tech molybdenum disulphide coating for faster break-in and extended piston life
• T-5 Heat Treatment — Hardening and tempering cycle for superior strength and durability under race conditions
• OEM-Quality Fitment — Drop-in replacement with no machining required
• Reduced Oil Consumption — Tight tolerances minimize blow-by for a cleaner, more efficient engine

Fitment

• KTM 85 SX: 2018–2023
• GasGas MC 85: 2021–2023
• Husqvarna TC 85: 2018–2023

Note: Measure your cylinder bore before ordering to confirm size A is correct for your application. Consult your service manual for bore specifications.

Why Vertex?

Vertex Pistons are manufactured in Italy and trusted by professional race teams worldwide. Their precision engineering and premium materials make them the top choice for serious motocross mechanics rebuilding 85cc race engines.