Lahiri, who shot 76 on the opening day in a round that finished late in the evening and in wet conditions, brought around a nine-shot swing in his card with a bogey-free five- under 67.
"More than anything else I will now get to play four rounds of Links golf before Open next week at Royal Birkdale. That was my plan and that was why I added Scottish Open to my schedule," said Lahiri.
"So, hopefully I will get into a better frame and adapt myself better in time for the Open at Birkdale."
India's other player in the field, SSP Chawrasia, who will finish late today was one-over through nine holes and he was also one-over for the tournament.
With the afternoon play yet to finish, two-time Open champion Padraig Harrington moved into sole lead at nine- under, following up his 67 in the first round late on Thursday with a fine four-under 68 in the second.
Alexander Knappe of Germany was six-under for the day and eight-under for the tournament. Also at eight-under was Callum Shinkwin and he had three holes to play.
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