Bruce, if you do business with Tower Hobbies, on the internet, go to their page for the LA 40 S control line engine. In the parts superstore page for that engine, you can find the venturi and needle valve assembly. I think they charge about $20 for both. You can also get all kinds of CL stuff, to include engine parts, from Virginia Hobbysport. Their toll free # is 866-359-8266. Glen