Richard Kerr ended day one at Knockhill on top as he beat Joe Francis to the fastest time of the day with a 48.769s lap, as the weather picked up for the afternoon session at Knockhill.
Tom Ward was third, ahead of Brent Harran while Charlie Nesbitt ended the day fifth.
Pirelli National Superstock Championship with MotoNovo Finance, Knockhill, FP2
1. Richard Kerr (AMD Motorsport)
2. Joe Francis (Stauff Fluid Power Kawasaki) +0.073s
3. Tom Ward (IN Competition/Aprilia) +0.208s
4. Brent Harran (Optimum Bike Racing) +0.446s
5. Charlie Nesbitt (VisionTrack Suzuki) +0.451s