Rusty, also as a note i only order the .25 size venturi. It is about ..020 smaller than the 40 size and works fine, unless maybe you have something 50 oz or bigger. One good thing about having the .25 size venturi is you can use it on a .25 size engine if you need it! I also make venturi's from .257 id nylon bushing stock available at Home Depot , easy to do if you have access to a lathe. Curtis Shipp's backplates are great , if you need you can still use the plastic stock one , i put flat washers on the screws and use a bit of silicone around the plate when i need to use one, don't over tighten! The la .40 engines that i have work well. I do have a couple that i have st needles in, they work fine, only prob is now the crankcase and the venturi have to be matched to that needle size.
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