Needles for DellOrto Carburetors DellOrto calls their needle jet an 'atomizer' and you need to make sure your DellOrto carb has a 2 stroke atomizer because the 4 stroke atomizers have more air holes in their sides which changes the flow which makes my calculator unsuitable for selecting a good needle. (This holds true for all carburetors.) 2 stroke atomizers are labeled AQ, AU, AV, AS, AB, AF, AR. The hole diameter is known by dividing the atomizer # by 100. This site lists the atomizers and their carburetors. This site also sells atomizers without listing any spec but their hole diameter. Treatland sells genuine Dellorto jets. Here's what DellOrto carbs are often equiped with:   Following is the Dell'Orto data on needles for carbs PHBN, PHBG, PHBL, PHBH, PHBE.      The commas represent decimal points in tthe chart below. It looks like some needles have 3 tapers but actually the last one is just a straight section.  
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