Walbro Carb Comparison

WT-644 Carburetor
WT-257 Big Bore Carburetor
WT-813 Big Bore Carburetor
644carb
257carb
813.carb
Venturi Bore: 12.7mm
Venturi Bore: 12.7mm
Venturi Bore: 12.7mm
Throttle Bore: 15.84mm
Throttle Bore: 15.84mm
Throttle Bore: 15.84mm
Primer Bulb: Yes
Primer Bulb: No
Primer Bulb: Yes
Choke: Yes
Choke: No
Choke: No
Mounting holes - Center to Center: 31mm
Mounting holes - Center to Center: 31mm
Mounting holes - Center to Center: 31mm
Accelerator Pump: No
Accelerator Pump: No
Accelerator Pump: Yes

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