Big venturi carb
Manufacturer: Walbro
Manufacturer part number: WT 1048
Big Bore Racing Carb from Zenoah (Walbro WT-1048), Designed for use with Zenoah watercooled (PUM) engines. Contains items shown in photo - Walbro WT-1048 carburetor (very similar to WT-257) but with 13.5mm venturi  (The WT-257 has a 12.7mm venturi). 
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