what does the manual say? it would either be freeplay on the cable using the jamnut on the cable end at the carb bracket, or alignment marks on the pump at wide open throttle. havent worked on an srv for a long, long time, but they were fun back in the day. had both an 86 and 88, piped, ported and shaved. there used to be a srv specific website around, google srv or sacha hindles srv, or something to that effect, you will probably find it.