Julian Simon, fastest on day one of the Jerez 125cc test, pulled over one second clear of Aspar Aprilia team-mate and nearest rival Bradley Smith during Tuesday's second day of track action.

Despite a fall, Simon set a best time of 1min 47.908sec during his 50 laps, an improvement of 0.967sec compared with Monday. Smith lowered his own lap time by 0.45sec to sit 0.538sec clear of third placed Sandro Cortese, the top non-Aprilia rider.

KTM's Marc Marquez dropped one place to fourth, while Sergio Gadea rose to fifth - at the expense of Scott Redding.

Testing concludes on Wednesday.

Jerez 125cc test - day two:

1. Julian Simon Aprilia 1min 47.908sec
2. Bradley Smith Aprilia 1min 48.863sec
3. Sandro Cortese Derbi 1min 49.401sec
4. Marc Marquez KTM 1min 49.491sec
5. Sergio Gadea Aprilia 1min 49.976sec
6. Scott Redding Aprilia 1min 50.219sec
7. Esteve Rabat Aprilia 1min 50.429sec
8. Dominique Aegerter Derbi 1min 50.559sec
9. Cameron Beaubier KTM 1min 51.477sec