" I tried to set up a 1 1/4" SU "
Way too small , you cant overcarb an engine with an SU as its variable venturi
I went for the 1 3/4" but if I did it again I'd probably do twin 1 3/4" SUs or a single 2"
Be careful with the Weber , if you're buying a new kit you won't have problems but if you're using a second hand unit try and find one off an engine of similar size . I tried using a sidedraft Weber off a Fiat 1100 and it was way too small and had fixed choke sizes so I went to the SU , the sidedraft Weber looks VERY cool on an old Willys engine and you wont have to worry about carb to bonnet clearance
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Tony G, an expat Aussie in the jungles of Java since 2000 , Jakarta Indonesia
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