On my Cessna 150 with the O-200 series engine. What caught my attention was a slight vibration at 1200 RPMs. Mag checks are smooth and about 100 RPMs on the drop so that rules the ignition out, also the primer is in and locked so it doesn't seem to be a fuel issue. I'm thinking it will be an induction leak but it is a 30 minute flight to the mechanic shop. Does anyone out there have experience with this or similar issues? Is it advisable to fly the plane to the mechanic with this apparent issue? Feel free to ask questions also if my description is vague.