Onboard and exterior recording of a Yamaha 24MX 125 cc dirtbike. The recording consists of 11 channels, two exhaust, driver back, chain, two engine, intake and 4 synced exterior channels, left, right, surround and following shotgun. It contains several start, stop, idle, blips, revving at constant rpms without gear, various accelerations and decelerations, driving while braking to get even rpms etc. Driver back channel is missing for the first startup, and chain channel suffers from bad contact last startup, but we decided to keep those in since they still contain many useful parts. The recording length is 19 min 3 s.