Ramsey held a one-stroke lead over Danny Willett and Paul Lawrie, who won last week's Johnny Walker Championship and shot 67 Saturday.
Ramsey slogged his way to a one-stroke lead with a bogey-free round despite another lengthy delay due to fog and overnight rain that saturated the course.
The conditions caused tournament officials to change the sixth hole to a par three and reduce par for the entire course to a 70.
Lawrie started out on a high note with an eagle on the first hole but cooled off on the back nine with a double-bogey on the par-5 14th hole. Willett also carded an eagle on No. 1.
Second-round leader Julien Quesne shot 70 Saturday and slipped to fourth place at 9-under 203.