Genuine Mikuni Super BN (SBN) Pop Off Spring.
Mikuni offers the following sizes: 65g, 80g, 95g, 115g. Sold individually.
Mikuni part number: 730-03030, 730-03033, 730-03027-T, 730-03027.
*It is recommended to remove your carbs and see what color / size spring you are currently running before ordering.
Find Mikuni SBN carb rebuild kits here.