Special Valve Spring Retainer (Titanium) Super Head (+R), R-Stage (+D)

By changing from steel valve spring retainers to titanium alloy valve spring retainers and reducing the weight of the retainers, the inertia weight and valve train weight are reduced, improving followability at high RPMs.
Compatible with Takegawa cylinder heads with valve stem shaft diameter of φ4.5.
For R-Stage EM, R-Stage+D, Monkey Super Head+R, Ape Super Head ST-3, Ape Super Head+R.
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