I am a resident of North Karachi so I know Meeran Autos. It is near Nagan chowrangi, north Karachi. He is a specialist for Suzuki bikes in my area. I my self go there regularly and find him good and honest. You can without any hesitation go there.
You can find him near nagan chowrangi (Supreme Avenue). Meeran autos and mechanic name is Tariq.
Come straight to Nagan bridge. Use bridge and go towards Upmore. Upon reaching bridge end, move to right for U turn. Take U turn. Now when PSO pump comes move to service road and go straight follow the road. You will see masjid Siddiqu-e-Akbar. After masjid you will see road bending, move to extreme left and go straight. After 1 or 2 kms you will see a board of Meeran Autos the big S of suzuki.