The photos are here & the story and pics are under Aircooled Pocketbikes.
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When it comes to the size of the venturi, it's no different than any other HDA-223. There is no difference in the A/B/C/D and so on.I have a 223B, it's 19 in the front 16 in the middle and 19mm in the rear, you must have an older model. I had to hog out the 16mm manifold to 19mm and put a Dave's 20mm tall V-stack. Plus it's a purge carb.