Me and a friend just purchased our first DRZ's and we are still waiting on the service manual CD to get here. We were checking over the bikes and noticed there is a small hose that connects on one end to the carb on the other appears to go to the petcock but they are disconnected on both bikes. Should this be connected or not? One of them appeared to be disconnected and tucked away purposely. Both bikes run perfect without it but it seems like any dust, etc would get sucked straight to the engine. Thanks for any help.