Carb Settings and Notes for '76-'77 Yamaha XS360C/2D Twin
49 States
Mikuni Type BS34 (First Gen)
Carb ID 1L9
Main Jet - 135
Idle Jet - 17.5 (VM22/210))
Fuel Passage Plug - No
Jet Needle - 4FP21-3
Needle Jet - X6
Float Height - 26.6mm +- 1mm
Air Screw - 1.5 Turn
Carb Settings and Notes for '77 Yamaha XS400D Twin
49 States
Mikuni Type BS34
Carb ID 2A2 60
Main Jet - 142.5
Idle Jet - 45 (BS30/96)
Fuel Passage Plug -
Jet Needle - 5Z1-4
Needle Jet - X4
Float Height - 26.6mm +- 1mm
Air Screw - 1.5 Turn
Carb Settings and Notes for '78 Yamaha XS400E Twin
49 States
Mikuni Type BS34
Carb ID 2L0 60
Main Jet - 132.5
Idle Jet - 42.5 (BS30/96)
Fuel Passage Plug -
Jet Needle - 5Z1-3
Needle Jet - X6
Air bleed jet - 160
Float Height - 26.6mm +- 1mm
Air Screw - 1.25 Turn
Carb Settings and Notes for '78 Yamaha XS4002E Twin
49 States
Mikuni Type BS34
Carb ID 2G5 60
Main Jet - 137.5
Idle Jet - 42.5 (BS30/96)
Fuel Passage Plug -
Jet Needle - 5Z1-3
Needle Jet - X6
Air bleed jet - 160
Float Height - 25.7mm +- 1mm
Air Screw - 1.5 Turn
Carb Settings and Notes for '79 Yamaha XS400F/2F Twin
49 States
Mikuni Type BS34
Carb ID 2L0 60
Main Jet - 132.5
Idle Jet - 42.5 (BS30/96)
Fuel Passage Plug -
Jet Needle - 5Z1-3
Needle Jet - X6
Air bleed jet - 160
Float Height - 26.6mm +- 1mm
Air Screw - 1.25 Turn
Carb Settings and Notes for '80 Yamaha XS400G/SG Twin
49 States
Mikuni Type BS34
Carb ID 3F9 00
Main Jet - 135
Idle Jet - 42.5 (BS30/96)
Air bleed jet - 160
Fuel Passage Plug - Yes
Jet Needle - 5GZ9
Needle Jet - 271 Y2
Float Height - 22mm +- 1mm
Air Screw - 1.25 Turn
Carb Settings and Notes for '81 Yamaha XS400H Twin
49 States
Mikuni Type BS34
Carb ID 3F9 00
Main Jet - 135
Idle Jet - 42.5 (BS30/96)
Air bleed jet - 160
Fuel Passage Plug - Yes
Jet Needle - 5GZ9
Needle Jet - 271 Y2
Float Height - 22mm +- 1mm
Air Screw - 1.25 Turn
Carb Settings and Notes for '82-'83 Yamaha XS400 Maxim
49 States
Mikuni Type BS34
Carb ID 12R
Main Jet - 125 (Left) 115 (Right)
Idle Jet - 42.5 (No-bleed type)
Air bleed jet - 170
Fuel Passage Plug - No
Jet Needle - 4HZ17
Needle Jet - 395 X8
Float Height - 21mm +- 1mm
Air Screw - 2 Turn