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Walbro Carb Comparison
WT-644 Carburetor
WT-257 Big Bore Carburetor
WT-813 Big Bore Carburetor
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