Vertex Cast Replica Piston Kit - KTM 50 SX / 50 SX Mini / 50 SX Pro Jr 2009-2024 | 23429CD

The Vertex Cast Replica Piston Kit (23429CD) is a precision-engineered replacement for the KTM 50 SX, 50 SX Mini, and 50 SX Pro Junior — covering model years 2009 through 2027. Supplied in size CD, this kit delivers exact bore fitment to maximize power, minimize blow-by, and extend engine life in your 50cc machine.

What's Included

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

Key Features

• Size CD Piston — Precision bore-matched for maximum power and minimal blow-by
• Cast Replica Design — OEM-spec construction for reliable, consistent performance
• 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 under race conditions
• Drop-In Fitment — No machining required; direct replacement for compatible KTM 50cc engines

Fitment

• KTM 50 SX: 2009–2027
• KTM 50 SX Mini: 2009–2027
• KTM 50 SX Pro Junior: 2009

Note: Verify your cylinder bore measurement corresponds to size CD before ordering. 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 youth and mini race engines.