I guess you've got a 32/36 weber - this has two chokes - a 'little' 32 for pottering around on (ie you're not pushing along way down on the accelerator) and a bigger 36 choke (which only comes into play whn you push a little further)
The stocker is just a single choke (size dependant on year I think)
The two choke design is supposed to give you the best of both worlds - good mpg when you're not in a hurry and a boost of speed when you are.
I found the they just give you flat spots and carb icing from hell - but I know others swear by them....
Ive just recently put one on my 1600 twin ported buggy.
Once I got the correct jet sizes it is very good.
Ideal for the more stock engine.
No problems with iceing up, but I have connected the pre heat tubes to the exhaulst, Some folks dont.
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