The Serpent SER903728 2-speed spring is a service item for the Viper 989 GP that helps maintain steady gear engagement. It is suited to track use where reliable shifting matters lap after lap.
Made for the Serpent Viper 989 GP and compatible SRX8GT R GP SER600072 installations, the spring gives repeatable tension and supports clean transitions between gears. It is useful for both tuning and routine upkeep.
To replace the spring, power down the model and follow the manufacturer procedure to open the gearbox. Fit the replacement, verify seating and reassemble, then perform a static test to ensure the gearbox shifts properly before running.
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