Aprilia Area 51 Wiring Diagram - View and Download APRILIA SR 50 use and maintenance book online. SR 50 Scooter pdf manual download.. Page 1. Classic 125 aprilia part# 8102785 Page 2. This manual is to be considered an integral part of the vehicle, which must be delivered complete with it also in case of resale. aprilia s.p.a. reserves the right to modify its models at any time, without prejudice to the main characteristics here described.. 1982-87 Yamaha QT50 has Mikuni VM12SC 4L4-00 with #70 jet This is a 12mm carb, 20mm clamp diameter. It is the same as the 3L5 except for the idle air screw. The.