Due to wet, damp conditions the Dundrod 150 superbike qualifying session, was classed as free practice.
11 times Ulster Grand Prix winner Guy Martin set the pace in practice, following lap speed of 116.121 mph on Tyco BMW superbike.
Honda Racing’s Conor Cummins 115.458 mph finished second fastest, recently crowned Irish road race supersport champion William Dunlop showed strong pace lapping at 114.627 mph, to finish third quickest.
Russ Mountford piloting Silicone Engineering Racing ZX10R Kawasaki, was fourth fastest following lap speed of 114.356 mph.
TT 2015 hero Ian Hutchinson sealed fifth quickest lap speed of the practice session, as he lapped at 114.144 mph on Paul Bird Motorsport ZX10R Kawasaki.
Keith Amor competing on Rig Deluge Road Racing S1000RR BMW finalised the top six in practice.
Lightweight TT winner Ivan Lintin, Valvoline Racing by Padgetts Motorcycles Dan Kneen, Mar Train Racing’s Dean Harrison, Derek Sheils, Derek Mcgee, all showed top class pace.
Topping the time sheets in Dundrod 150 national/challenge practice was Glenn Irwin. Competing on Gearlink ZX6R Kawasaki he lapped at 109.283 mph to finish fastest.
2014 Irish road race super twins champion Connor Behan finished second quickest, whilst Timmy Elwood impressed with third fastest time, as did newcomer to Dundrod Forest Dunn who rounded out the top five in practice.
Paul Owen 100.975 mph lead the way in lightweight practice, from Seamus Elliott 100.965, Neil Kernohan 100.545 mph, reigning Duke Road Race Rankings champion James Cowton.
Ultra lightweight practice saw 2007 North West 200 250 winner Christian Elkin, on top following impressive lap speed of 100.726 mph.
Second fastest was rising road racing star Paul Jordan who was followed by Nigel Moore and ninth place finisher in 2015 lightweight TT, Connor Behan.