It's on the inlet manifold at the right end as you look at the engine, it looks like a small cola can and is held on with two bolts, there are two small "O rings" that seal it onto the inlet manifold, these will need to be replaced with new items on refitting, if your removing it to clean it ONLY use a "Spray Carb cleaner" as WD40 will cause it to gumm up even quicker!!
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