As for fixing the air flow, a velocity stack can be added. There are many ways to modify the air filter on SHA carbs, highlighted on the Moped Army site, but I wanted an even more free-flowing filter and to use the materials I have around the house. I feel that some of the issues with the carb's performance can come from fixing that sharp edge, and air filter. The throat opening from the air filter is a perfect right angle edge- not conducive to smooth air flow. The air filter does not filter anything smaller than a bird, and only disrupts air flow. One of my biggest gripes with the design of the Dellorto SHA line of carbs is the design of the air filter and the start of the carburetor throat. However, the Dellorto SHA carbs are not without major flaws. Tuning a SHA is very similar to tuning a Bing carb, which I am familiar with from working with my Sachs-engined Columbia Commuter. Many serious tuner dislike the SHA line, though I am drawn to the simple, solid design. Those familiar with mopeds will be familiar with Dellorto carbs they are probably one of the most common brands.
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