Kyosho Inferno MP7.5 Alloy Upper Arm Bulk for Front Gearbox (Caster 2deg, Toe-in +2deg) by GPM MP7509A  [MP7509A]

Upper arm bulk for front gearbox

This is an RC-scale replacement upper arm bulk designed for the Kyosho Inferno MP7.5 front gearbox assembly. The part locates the upper arm pivot and sets a fixed caster of 2deg with a +2deg toe-in orientation, serving as a direct-fit hop-up for MP7.5 chassis geometry adjustments.

Installation is typical for MP7.5 front gearbox components, using the existing mounting points on the gearbox and upper arm tower. Use the stock hex screws and recommended thread engagement, avoid over-torquing to protect mating plastic parts, and check alignment after tightening to confirm the intended caster and toe settings.

In tuning terms this bulk provides a consistent reference for front suspension geometry when changing arm lengths, shock positions, or roll center settings. Use it when you need a repeatable caster and toe baseline for setup comparisons or when replacing a worn or damaged factory part on the MP7.5 platform.