Carb Settings and Notes for '78-'81 Yamaha XS650
Mikuni Type BS34
Carb ID 3G1
Main Jet - 132.5
Idle Jet - 42.5 (BS30/96)
Fuel Passage Plug - Yes
Jet Needle - 5XH12
Needle Jet - Y0
Float Height - 27.5mm +- 1mm
Air Screw - 2 Turn
Carb Settings and Notes for '82-'83 Yamaha XS650
Mikuni Type First Gen BS38
Carb ID 5V4
Main Jet - 132.5
Idle Jet - 42.5 (BS30/96)
Main Air jet - 135 (Carb Intake)
Fuel Passage Plug - Yes
Jet Needle - 5XH12
Needle Jet - Y0
Float Height - 22mm +- 1mm
Air Screw - 2 Turn