Throttle shaft for most Walbro WT-style carburetors. PDF Print $2.75 SKU: WBR-30-977-1 Throttle shaft for most Walbro WT-style carburetors. Add to Wishlist Add to Compare Back to: Walbro Carbs & Parts Description This a oem replacement throttle shaft for a wt257 carb. Do not throw that carb away when you can repair it with a new throttle shaft. Will also work with other similiar model carbs.