Joe Francis beat local favourite Lewis Rollo to the top of the FP1 timesheets as he clocked a 53.919sec lap of Knockhill.
Charlie Nesbitt ended the session third, just ahead of Ash Beech as Davey Todd rounded out the top five.
Pirelli National Superstock Championship with MotoNovo Finance, Knockhill, FP1:
1. Joe Francis (Stauff Fluid Power Kawasaki)
2. Lewis Rollo (Milenco by Padgetts Motorcycles) +0.345s
3. Charlie Nesbitt (VisionTrack Suzuki) +0.458s
4. Ash Beech (Jones Dorling Racing) +0.788s
5. Davey Todd (Milenco by Padgetts Motorcycles) +1.204s