the 1 long and 3 short is the water temp sensor short code. Like stagss said, you need to use a resistor and place it in a wire when going from the viper to srx cdi box on a viper wire harness. search for concept carbon, all the information will be in his thread for the viper to srx conversion.
the carbs look the same and are the same size but the viper is a leaner set up then the srx is on the needles and nozzles. the slides are differnt also for the cut away which will effect the idle speed setting.
modsrx didnt need it because he started with a srx first not a viper harness.
