Re: how to tell a 750Qjet from a 800 Qjet
Lonnie, On the 1.21 venturi carbs, the top screw that's inside the choke horn, will just about fall through between the venturi cluster (booster ring) and the outer wall. On the 1.09 it won't be close.
After studying that area, you'll be able to tell be the shape and curvature of the venturi wall.
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