Just wondering if part Part #48-5011, would work in my carbs on my 81 xs400 special? I'm assuming it will since the xs650 that this mixture screw is for the bs34. Mikes xs says that it Fits: XS650G/H/SH/SJ/SK/SL (1980-84). So if anyone knows if this mixture screw w spring, washer, and o-ring is the correct one for my bike and if not does anyone know where to get one for our bikes?