Serpent 903813 2-Speed Shaft Mounting Screw Adapter Lightweight Edition  [SER903813]

Improve Gear Transition on the Viper 990 GP with Serpent 903813

The Serpent 903813 lightweight mounting screw adapter is engineered for the Viper 990 GP chassis to reduce rotating mass at the 2-speed shaft. That reduced inertia helps the gearbox engage more reliably under load.

Practical Gains for Club and Track Use

By cutting weight where it matters, the Serpent 903813 assists with smoother gear changes and a more predictable drive feel. The precision fit supports consistent performance over repeated runs.

Compatibility, Fit and Care

This adapter fits Viper 990 GP (SER903020) applications and can be fitted as part of a standard service. After fitting, verify torque settings and re-check during early running to confirm there is no play.