Revotec Retroswitch 'Otter' Choke Solenoid Switch - Jaguar XK120/140/150

The Revotec Retroswitch is used to control the automatic choke solenoid on Jaguar XK120, XK140 and XK150 engines. It restores correct choke disengagement once the engine is warm by replacing the original 'Otter' switch, which often fails over time and causes rough idling.Explore the key features of this switch and how they contribute to performance and reliability:Direct Replacement Design: Engineered to match the physical dimensions and fitment points of the original 'Otter' unit, this switch installs directly into your existing setup without the need for modification, allowing you to restore choke function with minimal disruption.OEM Appearance: Manufactured with period-correct materials and finishes, the unit blends seamlessly into your engine bay, helping you preserve originality while still improving functional reliability.Cork Gasket Seal: Supplied with a precision-cut cork gasket, this feature ensures a secure and leak-free seal to the intake manifold, reducing the risk of vacuum leaks that can affect idle quality and throttle response.Choke Control Thermostat: Uses a temperature-sensitive element to deactivate the choke solenoid once the engine reaches operating temperature, preventing over-fuelling and resulting in smoother running and cleaner combustion during warm conditions.Fitting this switch ensures that your automatic choke disengages as intended once the engine is warm, helping you avoid poor idle behaviour caused by a permanently engaged choke. It's a practical solution that supports smoother driving and more predictable cold starts. A smart addition to your Jaguar XK setup, especially if you're maintaining both originality and daily usability.