Rear Swing Shaft IF144B for Inferno MP Series NEO 3.0 & 4.0 by Kyosho  [KY-IF144B]

How the swing shaft influences rear handling

The Kyosho IF144B swing shaft is intended as a direct replacement for the rear suspension pivot on Inferno MP Series NEO 3.0 and 4.0. This overview focuses on fit, installation tips, and how shaft condition affects rear suspension geometry and tuning feedback.

Primarily the swing shaft positions the rear hub assembly and provides the pivot axis for the swing arm. When the shaft or bushings wear, play develops and can upset traction and handling consistency. Installing a fresh shaft restores pivot alignment and reduces unintended lateral or vertical wheel movement.

Fitting the part typically involves rear hub removal and some disassembly of the swing arm pivot. Check retaining clips, bushings, and related screws or pins during replacement and reuse original hardware if still serviceable. Use the correct hex drivers and verify the swing arm travels without binding after assembly.

From a tuning perspective, the change is subtle but meaningful: removing pivot slop allows shock and anti-squat adjustments to perform predictably, revealing the real effects of setup changes. When you notice unpredictable rear behaviour, inspect shaft wear and hub tightness before altering spring rates or shock lengths.

Compatibility

• Inferno MP Series NEO 3.0
• Inferno MP Series NEO 4.0

Choose the IF144B to reestablish correct rear pivot geometry or to replace a worn shaft; confirm the replacement part matches the original before finishing reassembly.