An optional aluminum main shaft produced as Yokomo Z4-644H for the YZ-4 platform. The hard anodized finish resists wear while trimming weight compared with steel, and the part is intended for drivetrain use on YZ-4 models.
As a drivetrain component, the shaft reduces rotating inertia on the gearbox axis, which can yield quicker throttle response. These adjustments are subtle and meant for fine tuning rather than wholesale driveline changes.
Installation requires basic gearbox disassembly to remove the stock shaft and bearings; verify bearing alignment and clearances after fitting and ensure the shaft seats securely before running the model. No special modifications or extra tools are specified by the source information.
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