Kyosho FA631 - Steel Spool Cup (FZD2) for FAZER D2 chassis  [KY-FA631]

Steel Spool Cup for FAZER D2

This is an RC-scale steel spool cup designed for the FAZER D2 chassis kit, intended as a direct replacement spare part for the spool assembly. The FZD2 designation refers to its matching position and role within the FAZER D2 drivetrain layout.

Material choice and part geometry matter in spool assemblies; this component uses steel to provide a durable mating surface where the spool interfaces with surrounding bearings and diff components. In routine maintenance it is a common wear item to inspect and replace when the original cup shows abrasion or fit issues.

Installation is straightforward for hobbyists familiar with on-road kits: remove the relevant diff or spool assembly, inspect bearings and seals, swap the cup while keeping fasteners and spacer orientation consistent, and verify free rotation before full reassembly. No special tools beyond common hex drivers and standard workshop supplies are required.

For setup and tuning, this spool cup is a structural spare rather than a tuning kit by itself; consistent fit and low play help maintain predictable spool engagement and diff behaviour on drift setups. Hobbyists typically check fitment, bearing seating, and mating surfaces as part of corner-weighting, toe, and drift setup checks.