R&D Performance offers a unique supercharger air temp sensor interfacer which will be necessary on Ultra 250X units with the Stage 3 Engine Kit. The added boost pressure of the R&D 1.05 to 1 and 1.1 to 1 pulley will bring along elevated intake temperatures which can be defused or lowered back down to safe temperatures with the R&D Intercooler Upgrade Kit. However, the air temp sensor is located between the supercharger and the intercooler therefore transmitting a temperature rating that is higher than what is actually entering the engine. The R&D sensor interfacer will keep the engine out of limp home mode during a race moto. There have been some Ultra 250X models that will default into limp home mode if the charger temperature sensor is peaked prematurely. Any Ultra 250 which has this default occur on long rides on hot (115 degree) days should install the R&D Supercharger Temp Interfacer Kit. The Interfacer is an inexpensive fix for this randomly occurring problem.
