The JR-KFZ201-GU center shaft cup joint is an aluminum upgrade created for the KYOSHO Fazer Mk2 FZ02 on-road chassis. It replaces the original plastic cup with a machined metal unit to address wear and flex encountered during intense running sessions.
Constructed from aluminum and supplied with a gun-metal appearance, this direct-replacement part preserves original mounting points while offering improved durability. It is intended to keep driveline alignment consistent and extend service life under hobby use.
Fitting is intended for experienced hobbyists: remove the OEM cup, transfer any retained hardware if compatible, and fit the JR-KFZ201-GU. After assembly, confirm smooth rotation and correct engagement with adjacent bearings and couplers.
Tuning impact: upgrading to aluminum affects the drivetrain's compliance, potentially yielding firmer feedback and steadier behavior under load, which can assist in predictable handling during extended runs.
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