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This is a Genuine Mikuni short idle adjuster screw designed specifically for the HSR series performance carburetors, including the HSR42, HSR45, and HSR48. Manufactured in Japan to strict OEM standards, this adjuster provides smooth, accurate idle adjustment and long‑lasting durability. Unlike cheap offshore reproductions, this authentic Mikuni component ensures proper fit, correct thread pitch, and reliable operation. If your idle screw is worn, stripped, or missing, replacing it with a genuine part restores proper tuning capability and prevents carburetor damage. Perfect for Harley‑Davidson, custom builds, and any machine running Mikuni HSR carbs.
