Featuring a larger intake volume over the stock WT-644 carb, the Walbro WT-257 Big Bore Carburetor provides more fuel & air, translating to more horsepower! Venturi bore diameter: 12.7mm Throttle Bore: 15.84mm Primer Bulb: No Mounting hole’s distance between centers: 31mm Accelerator System: No Recommended Accessories (click for descriptions): Throttle Arm Stand-off (For WT-257/813-A carbs) Throttle Cable Assembly (Standard) Throttle Cable Assembly (Long)
