The Serpent 904213 mainshaft is an essential replacement part for the Viper 990E, made to deliver reliable alignment and consistent drivetrain behaviour. It suits hobbyists focused on upkeep or stepping up drivetrain efficiency.
Built with the Viper 990E in mind, this mainshaft provides a true fit and dependable wear resistance to keep power transfer smooth. Use it to replace a tired shaft or to support modest performance improvements without complex mods.
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