The FMF Factory 4.1 RCT is a single slip-on exhaust muffler for the 2027 Kawasaki KX250F and KX250FX. It replaces the muffler section without requiring a new header pipe and includes a screen-type spark-arrestor insert.

Features

• Resonance Chamber Technology (RCT) is incorporated into a shorter muffler layout designed to position mass closer to the engine and reduce exposure to crash damage.
• Includes FMF’s Rapid Tuning System (RTS) feature.

Specifications

• Muffler body: aluminium.
• Midpipe: stainless steel.
• End cap: carbon fibre.

Cross-Reference OEM Part Numbers

• FMF: 042424.

Vehicle Fitments

• Kawasaki KX250F: 2027.
• Kawasaki KX250FX: 2027.