The second hand market for Hobie kayaks is very healthy and as such lots of people choose to buy a second hand kayak. Unless the kayak has been purchased from a reputable dealership it is common that whoever sold you the used kayak didn't really tell you much of what you need to know. That being the case, we would highly recommend you to read this Hobie kayak maintenence guide (if you have purchased a pedal-powered kayak) and also take the time to view these Hobie Kayak Quickstart Videos